A normal male and a female carrier for red-green color blindness want to have children. Given that red-green color blindness is an X-linked recessive trait, what information should be given to the parents?
A) 25% males affected
B) 50% females affected
C) Females mostly affected; no males affected
D) Males mostly affected; females mostly carriers

Question

Quizplus · Accepted Answer

Red-green color blindness is an X-linked recessive trait, meaning it is carried on the X chromosome. Males (XY) are more likely to be affected because they have only one X chromosome. If they inherit the affected X, they will express the trait. Females (XX) can be carriers if they have one affected X, but they are less likely to be affected because they would need two affected X chromosomes. Thus, males are mostly affected, and females are mostly carriers.

A Normal Male and a Female Carrier for Red-Green Color