A single-gene disorder that occurs in males who have inherited one copy of an X chromosome with the affected recessive allele is known as an X-linked recessive disorder.

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X-linked recessive disorders are caused by a mutant allele on the X chromosome, and since males have only one X chromosome, they are more likely to be affected. Females can be carriers of the disorder if they inherit one copy of the affected allele, but they are less likely to show symptoms because they have another X chromosome with a normal copy of the gene.

A Single-Gene Disorder That Occurs in Males Who Have Inherited