A human female "carrier" who is heterozygous for the recessive, sex-linked trait red color blindness, marries a normal male.

What proportion of their female progeny will show the trait?

A. All

B. 1/2

C. 1/4

D. 0

Half the sons would be expected to inherit the color blindness allele from their mother. Half the daughters would be carriers like their mothers.

E. 3/4