A woman who does not carry the color-blindness allele has children with a man who is color blind.What proportion of their children will be color blind?

Question

Quizplus · Accepted Answer

Color blindness is typically inherited in an X-linked recessive manner. Since the woman does not carry the allele for color blindness, all her children will inherit a normal X chromosome from her. The sons will inherit their Y chromosome from their father and thus cannot be color blind, while the daughters will inherit an unaffected X chromosome from their mother and a color-blind X from their father, making them carriers but not color blind themselves.

A Woman Who Does Not Carry the Color-Blindness Allele Has