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n addition to A and a, the “agouti” gene has a third allele, AY . Here is some information
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n addition to A and a, the “agouti” gene has a third allele, AY . Here is some information about the inheritance of the AY
allele. The AY allele is dominant to both A and a. The homozygous genotype (AYAY ) results in lethality before birth. The
heterozygous genotypes (AYA or AYa) result in yellow fur color, regardless of which alleles are present for the B/b gene.
(This effect exhibited by the AY allele is known as epistasis--when the expression of one gene masks the expression of a
second gene.) Suppose you mate two mice with the genotypes AYaBb x AYaBb . Considering only the live-born offspring, what
would be the expected frequency of mice with yellow fur? (For help getting started, see Hint 1.) Express your answer as a
fraction using the slash symbol and no spaces (for example, 1/16).
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