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Agouti is a type of coat color pattern in mouse that cannot be expressed in albinos (white mice). A non-albino, agouti mouse that is heterozygous at the albino (A) and agouti (B) loci (AaBb) is mated to an albino mouse that is heterozygous at the agouti locus (aaBb). Non-albino mice without the dominant agouti allele (AAbb and Aabb) are black.
-What percent of the progeny do you expect to be agouti?
A) 0
B) 12.5
C) 37.5
D) 50
E) 100

Question

Quizplus · Accepted Answer

The agouti phenotype requires at least one dominant allele at both the albino (A) and agouti (B) loci. The cross AaBb x aaBb results in 1/2 of the progeny being non-albino (Aa or aa) and 3/4 having at least one dominant B allele. Therefore, 1/2 * 3/4 = 3/8 or 37.5% of the progeny are expected to be agouti.

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