Men are more likely to be colour-blind than are women.

Question

Quizplus · Accepted Answer

This is true. Men have a higher prevalence of colour-blindness than women because the genes responsible for colour vision are located on the X chromosome, of which men only have one copy. If that copy contains a colour vision deficiency gene, they will be colour-blind. Women, on the other hand, have two X chromosomes, so even if one contains a deficient gene, they may have a normal copy on the other X chromosome.

Men Are More Likely to Be Colour-Blind Than Are Women