Males with a recessive X-linked allele that causes a disorder do not always show symptoms because they can also carry a dominant allele on their Y chromosome.

Question

Quizplus · Accepted Answer

Males do not have a second copy of the X chromosome to mask the effects of a recessive X-linked allele. Therefore, if they inherit an X-linked recessive disorder, they will typically show symptoms of that disorder.

Males with a Recessive X-Linked Allele That Causes a Disorder