A red-eyed male Drosophila mates with a red-eyed female Drosophila. One of the female's parents had white eyes. What proportion of the male offspring will have white eyes?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

The female must be heterozygous for the trait. Thus, there is a 50% chance that she will pass this trait on to any of her male children.

A Red-Eyed Male Drosophila Mates with a Red-Eyed Female Drosophila