In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color-blind marries a man who also has normal color vision. He has brown eyes but his mother had blue eyes. Which of the following would you expect to be TRUE for their daughters?

Question

Quizplus · Accepted Answer

Since the woman has blue eyes (bb) and normal color vision (her father was color-blind, so she must carry one color-blind allele, XcX), and the man has brown eyes (Bb, since his mother had blue eyes) and normal color vision (XY), their daughters will all inherit an X chromosome from their mother (either X or Xc) and either a B or b allele from their father. They will inherit a normal X from their father, ensuring all daughters have normal color vision. The daughters can have either brown eyes (if they inherit the B allele) or blue eyes (if they inherit the b allele), leading to the expected distribution.

In Humans, Blue Eyes Are Inherited as a Recessive Autosomal