In fruit flies, red-eyes are dominant to white-eyes. In addition, eye color is a sex-linked trait. If a homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

Since the trait is sex-linked and the female is homozygous for the dominant red-eye trait, all female offspring will inherit a red-eye allele from her and thus cannot have white eyes.

In Fruit Flies, Red-Eyes Are Dominant to White-Eyes