If a color-blind (X-linked recessive trait) man marries a woman who is heterozygous for the trait, what proportion of their male offspring can be expected to be color blind?
A) 1/2
B) 1/4
C) 1/8
D) all
E) none

Question

Quizplus · Accepted Answer

A color-blind man (X^cY) and a heterozygous woman (X^CX^c) can produce male offspring that are either X^cY (color-blind) or X^CY (normal vision). There is a 1/2 chance for each male offspring to inherit the X^c from the mother and Y from the father, resulting in color blindness.

If a Color-Blind (X-Linked Recessive Trait) Man Marries a Woman