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In chickens, the allele for a pea comb (A) is dominant to the allele for a single comb (a). A mother with the genotype Aa and a

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The percent chance that the offspring will have a single comb is $25$ %

Explanation:

Given,

The allele for single comb represented as "a" is recessive to the allele for pea comb represented as "A"

Genotype of male - Aa

Genotype of female - Aa

Gamete of Male - A, a

Gamete of female - A, a

Cross between Aa and Aa will produce

AA, Aa, Aa, aa

Thus, out of four offspring only one has "aa" genotype and hence this individual will express the recessive trait i,e aa

The percent chance that the offspring will have a single comb is

$\frac{1}{4} * 100\\$

$25$ %

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