The recessive genes located on X-chromosome in humans are always

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(c) [Key Concept: X-linked Recessive Genes — Expression in Males] Recessive genes located on the X chromosome in humans are ALWAYS expressed in males (hemizygous). Males have only one X chromosome (XY), so any gene on their X chromosome — whether dominant or recessive — is fully expressed, as there is no corresponding allele on the Y chromosome to mask it. Females (XX) need BOTH X chromosomes to carry the recessive allele for expression. Males cannot be sub-lethal carriers of X-linked recessive alleles — they either express the trait or don't have the allele.

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