A woman who is a carrier for color blindness a recessive Xli

A woman who is a carrier for color blindness, a recessive X-linked trait, is married to a man who is color blind. Draw a Punnett square showing the genotypes of the parental gametes and their potential offspring. Be sure to indicate the sexes of the offspring, which ones will be color blind, and which ones are carriers. Use B to designate the normal allele and b for the allele that causes color blindness.

Solution

genotype of woman: X^BX^b; genotype of man: X^bY

Gametes by woman: X^B, X^b; gametes by man: X^b, Y

Punnett square:

X^B

X^b

X^b

X^BX^b

(female, carrier)

X^bX^b

(female, color-blind)

Y

X^BY

(male, normal)

X^by

(male, color-blind)