MCAT Question of the Day
    •

    Q:

    		 If a mutant gene is present in a gene pool as a dominant allele and the homozygous dominant genotype is lethal, what fraction of viable offspring will have at least one copy of the mutant gene in a cross between two heterozygotes?
    		 

    A

    		 1/3

    B

    		 1/2

    C

    		 2/3

    D

    		 3/4



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