Question

4. Colorblindness is an X-linked trait caused by a recessive allele. A carrier female marries a normal male. (Punnett Square: 4 points)

a. How many of the male offspring can be expected to be color-blind? (1 point)

b. How many of the male offspring can be expected to have normal vision? (1 point)

c. How many of the female offspring can be expected to be carriers? (1 point)

d. How many of the female offspring can be expected to be normal? (1 point)

Answer 1

a) 1/2 of sons can be expected to be color-blind.

b) 1/2 of sons can be expected to have normal-vision.

c) 0 daughter's can be expected to be color-blind.

d) all of the daughters