Question

In humans, red-green color blindness is inherited as an X-linked recessive. If a color-blind woman marries a man with normal vision what will be the expected phenotypes of their children with respect to this trait? (a) boys (b) girls

Answer 1

Answer:

a) Normal Vision but carrier of the X-linked recessive Red-green color blindness trait

b) Color Blind

Explanation:

Given - Red-green color blindness is inherited as an X-linked recessive (Xr)

Genotype of color-blind woman will be XrXr

Genotype of man with normal vision will be YX

Xr Xr * YX

XXr, XXr, YXr, YXr

All the girl child will be the carrier of the X-linked recessiveRed-green color blindness trait

While all the male child will be color-blind

a) Normal Vision but carrier of the X-linked recessive Red-green color blindness trait

b) Color Blind