Colorblindness is more common in males than in females because
A) males receive only one allele (on the X chromosome) for that gene for color vision.
B) females often do not experience the same gene-environment interactions as males.
C) the gene for colorblindness is on the Y chromosome.
D) the gene for red-green colorblindness is dominant.

Question

Quizplus · Accepted Answer

Color vision genes are located on the X chromosome. Males have only one X chromosome, while females have two. This means that if a male receives a colorblindness allele on his X chromosome, he will exhibit colorblindness, whereas females need to inherit two copies of the allele (one from each parent) to exhibit colorblindness. Therefore, colorblindness is more common in males than in females.

Colorblindness Is More Common in Males Than in Females Because