Aphenotypically normal woman is heterozygous for the recessive mendelian allele causing phenylketonuria, a disease caused by the inability to process phenylalanine in food. she is also heterozygous for a recessive x-linked allele causing red–green colorblindness. what percentage of her eggs will carry the dominant allele that allows normal processing of phenylalanine and the x-linked recessive allele that causes colorblindness?
a) 0%
b) 25%
c) 50%
d) 75%
e) 100%

The correct answer is B. 25% of eggs.

Explanation:

A phenotypically normal woman is heterozygous for:

This woman´s genotype is Pp XRXr

The woman´s possible gametes are: XR P, XR p, Xr P, Xr p

Each gamete has 25% of the possibilities to occur. The gamete Xr P carries the dominant allele for normal processing of phenylalanine and the X-linked recessive allele for colorblindness. 25% of the eggs will present these alleles.

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