Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?
A) XⁿXⁿ and XⁿY
B) XᴺXᴺ and XⁿY
C) XᴺXᴺ and XᴺY
D) XᴺXⁿ and XᴺY

Question

Quizplus · Accepted Answer

The mother must be a carrier (XᴺXⁿ) for the son to be color-blind, and the father must have normal vision (XᴺY).

Red-Green Color Blindness Is a Sex-Linked Recessive Trait in Humans