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| 1 |
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Q:
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Which of the following is(are) NOT an example of codominance?
I. a cross between a homozygous long beet and a homozygous round beet producing oval beets
II. a cross between a homozygous red flower and a homozygous white flower producing a spotted white and red flower
III. a cross between a homozygous blue-eyed person with a heterozygous brown-eyed person producing offspring with blue eyes |
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A
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I only |
B
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II only |
C
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I and II only |
D
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I and III only |
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Tags:
Mendelian Concepts | |
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| 2 |
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Q:
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A heterozygous blue flower is bred with a homozygous recessive white flower. Assuming that the blue gene is dominant, what will be the ratio of the blue to white flowers? |
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Tags:
Mendelian Concepts | |
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| 3 |
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Q:
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A researcher crosses a heterozygous yellow (dominant) plant with a homozygous recessive red plant. In the next generation, 653 plants were yellow. Which of the following answers is an approximate prediction for the number of red plants in the same generation as the 653 yellow plants? |
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Tags:
Mendelian Concepts | |
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| 4 |
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Q:
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Assume that in a certain flower population, there is only one gene for color. White is dominant over blue. 49% of the population is homozygous dominant. What percentage of the flower population are heterozygotes? Assume that the population is in Hardy-Weinberg equilibrium. |
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Tags:
Mendelian Concepts | |
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| 5 |
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Q:
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In a particular iguana species, the gene for green skin (G) is dominant over the gene for brown skin (g). If 50% of a large offspring of iguana have brown skin, the parental cross that produced this litter was most likely |
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A
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GG x Gg |
B
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GG x GG |
C
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Gg x gg |
D
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gg x gg |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 6 |
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Q:
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Some individuals with blood group A may inherit the genes for blond hair, while other individuals with blood group A may inherit the genes for brown hair. This can be explained by the principle of |
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A
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dominance |
B
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multiple alleles |
C
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independent assortment |
D
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incomplete dominance |
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Tags:
Mendelian Concepts | Human Genetics | |
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| 8 |
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Q:
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A particular genetic disease is autosomal recessive. What are chances that an individual offspring will have the disease if both parents are unaffected carriers? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 9 |
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Q:
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The gene for color blindness is X-linked recessive. One of the necessary conditions for a female to be color blind is: |
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A
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A mother who is colorblind. |
B
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A father who is colorblind. |
C
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A father and mother who are colorblind. |
D
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Neither parent to be colorblind, but both to carry the defective gene for colorblindness. |
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Tags:
Mendelian Concepts | |
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| 10 |
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Q:
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In a particular population, 40% of the alleles for a particular gene are dominant and 60% are recessive. What percentage of the population are heterozygous? Assume that the population is in Hardy-Weinberg equilibrium. |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 11 |
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Q:
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A researcher crosses a heterozygous yellow (dominant) plant with a homozygous recessive red plant. In the next generation, 653 plants were yellow. Which of the following answers is an approximate prediction for the number of red plants in the same generation as the 653 yellow plants? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 12 |
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Q:
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A heterozygous cross produces 1000 offspring. The offspring are paired, isolated, then mated, with all genotype pair combinations present in equal frequency. What proportion of the pairs will produce identical genotypes for all offspring indefinitely in subsequent generations? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 13 |
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Q:
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A mouse breeder found that the offspring between two mice had a 25% frequency of
"bb" genotype. What was the genotype of their parents? |
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A
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BB x Bb |
B
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bb x bb |
C
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Bb x Bb |
D
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BB x bb |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 14 |
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Q:
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Two organisms with the genetic makeup of RrSs are crossed. R and S are dominant. What fraction of the offspring do we expect to have exhibit phenotypic, dominant traits (RS)? |
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A
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1/16 |
B
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3/16 |
C
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1/4 |
D
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9/16 |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 17 |
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Q:
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In a population, there are only two alleles for a gene: B (dominant allele) and b (recessive allele). The ratio of B to b alleles in the population is 4 to 1. According to the Hardy-Weinberg equilibrium, what is the likeliness that a member of the population is heterozygous? |
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A
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2/25 |
B
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4/25 |
C
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8/25 |
D
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16/25 |
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Tags:
Mendelian Concepts | Evolution | Quantitative Skills | |
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| 18 |
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Q:
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Which of the following crosses can yield the following set of offspring?
aa, aa, aA, aA, aA, Aa, aa, Aa
I. aa x aa
II. aa x aA
III. aA x aA |
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A
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II only |
B
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III only |
C
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I and II only |
D
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II and III only |
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Tags:
Mendelian Concepts | |
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| 19 |
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Q:
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Dave and Janet want to start a family. Janet has an X-linked dominant disorder and Dave does not. Which of the following statements does not hold true? Assume that Janet is heterozygous for this trait. |
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A
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Each female child will have a 50% chance of inheriting the disease |
B
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One of Janet's parents must have had this disorder |
C
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If Dave had this disorder and Janet did not, all of their male children would have had the disorder |
D
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Female and male children each have an equal chance of inheriting the disease |
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Tags:
Mendelian Concepts | |
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| 20 |
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Q:
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Certain genetic diseases skip generations in some families meaning the parent generation (Generation 0) will phenotypically exhibit the disease, their children (Generation 1) will not, but their grandchildren (Generation 2) can exhibit the trait again. Such traits are typically |
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A
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autosomal recessive |
B
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autosomal dominant |
C
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X-linked dominant |
D
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The answer cannot be determined with the given information |
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Tags:
Mendelian Concepts | |
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| 21 |
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Q:
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For a particular gene, the recessive allele is lethal if the dominant allele is not present. In a cross between two heterozygotes, what proportion of viable offspring would be heterozygotes? |
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Tags:
Mendelian Concepts | |
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| 22 |
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Q:
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Which of the following patterns would be observed in a family for a gene that is a very rare sex-linked recessive allele? |
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A
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Approximately half of the males offspring in the family are affected. |
B
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Nearly all of the male offspring in the family are affected. |
C
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Only the females in the family are affected. |
D
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Males and females in the family are affected with roughly equal frequency. |
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Tags:
Mendelian Concepts | |
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| 23 |
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Q:
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A woman and her husband have five children. The woman and at least one son are afflicted with hemophilia, a recessive, sex-linked trait. Which of the following statements must true about the family?
I. The husband is a hemophiliac
II. All of the sons are hemophiliacs
III. All of the daughters are hemophiliacs
IV. All of the children are either hemophiliacs or carriers |
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A
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I and II only |
B
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II and IV only |
C
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IV only |
D
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I, II, and III |
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Tags:
Mendelian Concepts | |
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| 24 |
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Q:
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With complete dominance of a single allele, two phenotypes are possible. How many phenotypes are possible in codominance where there are two alleles? |
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Tags:
Mendelian Concepts | |
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| 25 |
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Q:
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For a population of birds in Hardy-Weingberg equilibrium, the red color is dominant while the purple color is recessive. For a sample of 1000 birds, if 640 are purple, what percentage of the birds are heterozygotes? |
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A
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8% |
B
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32% |
C
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36% |
D
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The answer cannot be determined with the given information. |
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Tags:
Mendelian Concepts | Evolution | Quantitative Skills | |
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| 26 |
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Q:
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In the dihybrid cross between AABb and AaBb, what fraction of the offspring will be homozygous dominant for A and homozygous recessive for B? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 27 |
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Q:
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For a species in Hardy-Weinberg equilibrium, if the frequencies of a dominant/recessive allele are 0.6 and 0.4, respectively, what is the percentage of dominant phenotypes in the population? |
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Tags:
Mendelian Concepts | Evolution | |
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| 28 |
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Q:
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Which of the following is false regarding autosomal recessive genes? |
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A
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The incidence rate is roughly equal in males and females. |
B
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The disease is present if one or both chromosomes have the defective gene. |
C
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The gene is not found on a sex chromosome. |
D
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Offspring from an afflicted parent and a non-carrier parent cannot be afflicted with the disease. |
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Tags:
Mendelian Concepts | |
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| 29 |
Go |
Q:
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Red-green color blindness is X-linked in humans. If a
male is red-green color blind, and both parents have
normal color vision, which of the male's grandparents is
most likely to be red-green color blind? |
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A
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paternal grandmother |
B
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paternal grandfather |
C
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maternal grandmother |
D
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maternal grandfather |
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Tags:
Mendelian Concepts | |
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| 30 |
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Q:
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In sickle cell disease, homozygous individuals present with the disease (production of abnormal hemoglobin) while heterozygotes are almost invariably asymptomatic, although they will produce normal as well as abnormal hemoglobin. This suggests which of the following about sickle cell disease? |
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A
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Sickle cell disease operates under complete dominance. |
B
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Sickle cell disease operates under incomplete dominance. |
C
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Sickle cell disease operates under codominance. |
D
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Sickle cell disease is a sex-linked trait. |
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Tags:
Mendelian Concepts | |
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| 31 |
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Q:
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For an X-linked trait, a man carries the defective gene and is afflicted with the disorder. What are the chances that his son will be afflicted if his son's mother is not a carrier of the trait? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 32 |
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Q:
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For a recessive phenotype of an autosomal gene which is lethal in utero, what proportion of viable offspring will be carriers of the gene if both parents are carriers? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 33 |
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Q:
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A student is studying sex-linked traits and finds that the only afflicted individuals in a family are males. The student concludes that the gene is X-linked and that some of the females in the family, while unafflicted, may still be carriers. Is this conclusion accurate? |
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A
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Yes, because an autosomal recessive X-linked gene can produce the phenotypes observed without any females being afflicted. |
B
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Yes, because males are always more susceptible to expressing X-linked traits. |
C
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No, because the gene could be Y-linked which would produce the same phenotypes observed. |
D
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No, because X-linked traits must be expressed in the phenotypes in any female carriers. |
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Tags:
Mendelian Concepts | |
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| 34 |
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Q:
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An X-linked recessive gene produces red-green color blindness in humans. A woman with normal color vision whose father was color-blind has children with a color-blind man. What is the probability that their daughter will be color-blind? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 35 |
Go |
Q:
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A genetic disease is found to be present in all the males of a family and does not skip generations. Which of the following must be true of the gene in question? |
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A
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The gene is autosomal dominant |
B
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The gene is autosomal recessive |
C
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The gene is found on the X chromosome |
D
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The gene is found on the Y chromosome |
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Tags:
Mendelian Concepts | |
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| 36 |
Go |
Q:
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Two individuals are both carriers of an autosomal recessive gene that is fatal in utero. What fraction of their children will be carriers of the gene? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 37 |
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Q:
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A woman carries an X-linked dominant gene on one of her X-chromosomes called DISe1 which gives her a particular phenotype. If she, theoretically, were to have 100 children, how many would be expected to have a matching phenotype? |
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A
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100 children |
B
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50 boys, 25 girls |
C
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25 boys, 25 girls |
D
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25 boys, 0 girls |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 38 |
Go |
Q:
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A woman is afflicted with a genetic disease that is X-linked and dominant. If only half her daughters are also afflicted with the disease, what percentage of her sons would be afflicted? |
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Tags:
Mendelian Concepts | Quantitative Skills | |
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| 39 |
Go |
Q:
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Two genes are noted for a particular kangaroo population. Kangaroos have gene X dominant, x recessive, and Y dominant, y recessive. How many possible genotypes exist in the F1 generation if an XXYY kangaroo is bred with a xxyy kangaroo? |
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Tags:
Mendelian Concepts | |
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| 40 |
Go |
Q:
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In fruit flies (Drosophila), sex determination is via the XY convention (same as in humans), and the gene for eye color is sex linked. Given that the allele causing white eyes is recessive to the wild type (red eyes) allele, what would be the observed offspring if a white-eyed female mates with a red-eyed male? |
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A
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All flies has red eyes
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B
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All males will have red eyes, all females will have white eyes
|
C
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All females will have red eyes, all males will have white eyes
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D
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50% of females will have white eyes, 50% will have red eyes, and all males will have red eyes
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Tags:
Mendelian Concepts | |
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| 41 |
Go |
Q:
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Given a certain species of flower, the color is determined by a gene with two alleles: the dominant allele (R) yields red flower color and the recessive allele (r) yields pink flower color. Another independently assorting gene determines the expression of flower color: the dominant allele (E) is needed for expressing color, and ee results in no color (white). In an experimental cross between a red and a pink plant, the resulting progeny is the following: 3/8 red; 3/8 pink; 1/4 white. Which of the answer choices below correctly describe the genotypes of the plants crossed? Note: because the cross was between a red and pink plant, this assumes color expression, meaning the red and pink plants are NOT ee. |
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A
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RREE x RrEe
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B
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Rree x RrEe
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C
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rrEe x RrEE
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D
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RrEe x rrEe
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Tags:
Mendelian Concepts | |
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| 42 |
Go |
Q:
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In humans, albinism is caused by an autosomal recessive allele that interferes with skin pigmentation. If two normally pigmented parents have an albino son, what is the probability that three of their next four children will be normally pigmented? |
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A
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3/4 |
B
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3/16 |
C
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27/64 |
D
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27/128 |
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Tags:
Mendelian Concepts | |
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| 43 |
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Q:
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Mendel's Law of Segregation, which states that maternal and paternal factors segregate independently into gametes, was developed from which type of experimental cross? |
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A
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Test cross (crossing a certain genotype to a double recessive)
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B
|
Monohybrid cross
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C
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Dihybrid cross
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D
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Trihybrid cross
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Tags:
Mendelian Concepts | |
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| 44 |
Go |
Q:
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A child is born with blood type A positive. The mother's blood type is A negative. Which of the following men could NOT be the father of the child? |
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A
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A positive |
B
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O negative |
C
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AB positive |
D
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B positive |
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Tags:
Human Genetics | Mendelian Concepts | |
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| 45 |
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Q:
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A single locus gene controls the color of a cicada. CC individuals are red and cc individuals are blue. Heterozygotes end up purple. If a purple and red cicada are mated, what percentage of the offspring would be blue? |
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Tags:
Mendelian Concepts | |
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| 46 |
Go |
Q:
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A population in Hardy-Weinberg equilibrium has 9% of its individuals as being homozygous recessive for a particular allele. What percentage of the population is homozygous dominant? |
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Tags:
Mendelian Concepts | |
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| 47 |
Go |
Q:
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Which of the following is an example of Mendelian inheritance? |
|
A
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Mitochondrial genes are inherited from the mother. |
B
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A trait is codominant with multiple alleles. |
C
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A single gene controls a phenotype through complete dominance. |
D
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A trait exhibits incomplete dominance between two alleles. |
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|
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Tags:
Mendelian Concepts | |
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| 48 |
Go |
Q:
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Cystic fibrosis has been studied at length and has been found to be a recessive genetic disorder. A female with cystic fibrosis has three children with a male who is a carrier of the cystic fibrosis gene. Which of the following correctly lists the probability that all three children are carriers of the cystic fibrosis gene, but do not have the disease? |
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A
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0% |
B
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12.5% |
C
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25% |
D
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100% |
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Tags:
Mendelian Concepts | |
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| 49 |
Go |
Q:
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In a large, non-migratory population, the proportion of individuals who are homozygous recessive for a gene is 0.49. Which of the following is closest to the expected number of heterozygotes from a group of 100 individuals? |
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Tags:
Mendelian Concepts | |
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| 50 |
Go |
Q:
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A particular medical condition is found to be an x-linked recessive gene. A man without the gene has a child with a woman who is a carrier for the gene. What percentage of offspring will have the condition? |
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Tags:
Mendelian Concepts | |
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| 51 |
Go |
Q:
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In a dihybrid cross, the phenotypic ratio is: |
|
A
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9:3:3:1. |
B
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8:4:4:2. |
C
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16:4:4:1. |
D
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6:3:3:1. |
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Tags:
Mendelian Concepts | |
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| 52 |
Go |
Q:
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A genetic pairing of parents both afflicted with the same disease produces many offspring. 1/3 of the offspring are unafflicted while 2/3 are afflicted. Which of the following can be concluded based on this information?
|
|
A
|
One parent is a heterozygote; the other parent is a homozygote. |
B
|
The disease is sex-linked. |
C
|
The disease is autosomal recessive. |
D
|
Receiving two copies of the disease gene is lethal. |
|
|
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Tags:
Mendelian Concepts | |
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| 53 |
Go |
Q:
|
The law of independent assortment, as it pertains to Mendelian inheritance, refers to: |
|
A
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alleles segregating from each other during formation of gametes such that each gamete only carries one allele for each gene. |
B
|
passing an allele for one trait does not increase or decrease likelihood of the passing of a separate trait. |
C
|
certain genes dominate in terms of phenotype over other genes. |
D
|
genes with two alleles may have both alleles contributing to the phenotype. |
|
|
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Tags:
Mendelian Concepts | |
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| 54 |
Go |
Q:
|
Hemophilia has an x-linked recessive pattern. Crossing a non-carrier woman with a male with hemophilia would result in: |
|
A
|
all sons with hemophilia. |
B
|
all daughters with hemophilia. |
C
|
all daughters as carriers for hemophilia. |
D
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all sons and daughters with hemophilia. |
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|
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Tags:
Mendelian Concepts | |
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| 55 |
Go |
Q:
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A small island in the pacific is noticed to have a disproportional number of individuals with red-green color-blindness. This may have been caused by:
I. a bottleneck.
II. genetic drift.
the founder effect.
|
|
A
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I only |
B
|
I and II only |
C
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II and III only |
D
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I, II, and III |
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|
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Tags:
Evolution | Mendelian Concepts | |
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| 56 |
Go |
Q:
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A population of crabs is studied and in a population of 1200 it is noted that 180 have a blue tint to their shell. It is hypothesized that blue tinting is a recessive trait in this population. Which of the following is the allelic frequency of the non-blue tinted allele? Assume that the population is in Hardy-Weinberg equilibrium. |
|
A
|
0.15 |
B
|
0.39 |
C
|
0.61 |
D
|
0.85 |
|
|
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Tags:
Mendelian Concepts | |
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| 57 |
Go |
Q:
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A particular plant population has two genes that each have two alleles (one dominant and one recessive). Breeding takes place such that one parent is homozygous recessive for both genes and the other parent is homozygous dominant for both genes. If two plants from the first generation of offspring are bred, how many possible phenotypes would be expected in this second generation? |
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Tags:
Mendelian Concepts | |
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| 58 |
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Q:
|
A particular population of jellyfish may glow bright green, the dominant phenotype, or may glow blue, which is the recessive phenotype. The green allele is G whereas the blue allele is g. The frequency of the GG genotype is found to be 0.35. Assuming Hardy-Weinberg equilibrium, approximately many heterozygous jellyfish would be expected in a population of 100 jellyfish? |
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Tags:
Evolution | Mendelian Concepts | |
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| 59 |
Go |
Q:
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How many phenotypes exist for blood type (blood group antigens)? |
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Tags:
Mendelian Concepts | |
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| 60 |
Go |
Q:
|
A particular lysosomal deficiency is a sex-linked recessive trait. If a female carrier and a male with this lysosomal deficiency produce offspring, which of the following hold true? |
|
A
|
all sons have the lysosomal deficiency |
B
|
all sons will be carriers |
C
|
all daughters will be carriers |
D
|
some daughters will have the lysosomal deficiency |
|
|
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Tags:
Mendelian Concepts | |
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| 61 |
Go |
Q:
|
A disease is studied in one family of patients and it is found that if fathers have the disease but the mothers do not, it is never passed down to sons. Which of the following holds true? |
|
A
|
the disease can only be X-linked dominant |
B
|
the disease can only be X-linked recessive |
C
|
the disease can be either X-linked dominant or X-linked recessive |
D
|
the disease is autosomal recessive |
|
|
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Tags:
Mendelian Concepts | |
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