A carrier homozygous for an X-linked recessive disorder is a female who has one copy of the mutated gene on each of her X chromosomes. They are considered carriers because they themselves are usually unaffected by the disorder but can pass on the mutated gene to their children.

In the case of an X-linked recessive disorder, males are more commonly affected than females because males only have one X chromosome, while females have two. In order for a female to be affected by an X-linked recessive disorder, she would need to inherit two copies of the mutated gene, one from each parent.

Carrier homozygous females can pass on the mutated gene to their sons and daughters. Their sons have a 50% chance of inheriting the mutated gene and being affected by the disorder, while their daughters have a 50% chance of being carriers themselves.