Hemophilia,color blindness,and Duchenne muscular dystrophy occur more often in males than females.Why?

Question

Quizplus · Accepted Answer

Hemophilia, color blindness, and Duchenne muscular dystrophy are caused by mutations on the X chromosome, and as males only have one X chromosome and no matching gene on their Y chromosome, they are more likely to express these traits. Females have two X chromosomes, and the presence of a normal allele on one X chromosome often masks the mutated allele on the other, resulting in a lower frequency of expression in females.

Hemophilia,color Blindness,and Duchenne Muscular Dystrophy Occur More Often in Males