Red-green color blindness is an X-linked recessive trait in humans. What is the probability that a color-blind woman and a man with normal vision will have a color-blind daughter?

Question

Quizplus · Accepted Answer

A color-blind woman has two X chromosomes with the color-blind allele (XcXc), and a man with normal vision has one normal X chromosome and one Y chromosome (XY). A daughter would inherit one X chromosome from each parent, so she would receive one Xc from her mother and one normal X from her father, resulting in a genotype of XcX, which means she would be a carrier but not color-blind.

Red-Green Color Blindness Is an X-Linked Recessive Trait in Humans