Color-blindness is more common in males than in females because:
A) females need to inherit only one copy of the recessive color blindness allele to express the trait.
B) males only need to inherit the recessive maternal color blindness allele to be color blind.
C) color-blindness is an autosomal trait.
D) all females are hemizygous for the color blindness trait.
E) males can only inherit paternal color blindness alleles.

Question

Quizplus · Accepted Answer

Males have one X and one Y chromosome, so inheriting one recessive color blindness allele on the X chromosome from their mother will result in color blindness. Females have two X chromosomes, so they would need two copies of the recessive allele to express the trait.

Color-Blindness Is More Common in Males Than in Females Because