Traits controlled by sex-linked recessive genes are expressed more often in males because:

Question

Quizplus · Accepted Answer

Males have one X chromosome and one Y chromosome, so if they inherit a recessive gene on their X chromosome, they will express the trait because they do not have a second, dominant gene on their Y chromosome to mask it. Females, on the other hand, have two X chromosomes and can be carriers of the recessive gene without expressing the trait themselves.

Traits Controlled by Sex-Linked Recessive Genes Are Expressed More Often