Which factor best explains why women are much less likely than men to experience red-green color blindness?
A) Women possess a certain dominant allele.
B) Women lack a certain recessive allele.
C) Women lack Y chromosomes.
D) Women have two X chromosomes.

Question

Quizplus · Accepted Answer

The genes for red-green color vision are located on the X chromosome, and men only have one X chromosome. Therefore, if they inherit a color blindness allele on their X chromosome, they will be color blind. Women, on the other hand, have two X chromosomes. If they inherit a color blindness allele on one X chromosome, their second X chromosome may have a non-mutated allele that can compensate for the color blindness. Thus, women are much less likely to experience red-green color blindness.

Which Factor Best Explains Why Women Are Much Less Likely