A color-blind boy has a mother with normal vision and a color-blind father. From which parent did he get the color-blind gene?

Question

Quizplus · Accepted Answer

Color blindness is often X-linked recessive. The boy inherits the X chromosome from his mother and the Y chromosome from his father. Since the father is color-blind, he has an X chromosome with the color-blind gene, but he passes his Y chromosome to his son. Therefore, the boy must have inherited the color-blind gene from his mother, who is a carrier.

A Color-Blind Boy Has a Mother with Normal Vision and a Color-Blind