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[[Image:XlinkRecessive.jpg|right|X-linked recessive inheritance]]
'''X-linked recessive''' is a mode of [[Mendelian inheritance|inheritance]] in which a mutation in a [[gene]] on the [[X chromosome]] causes the phenotype to be expressed ''only'' (1) in males (who are necessarily [[Zygosity|hemizygous]] for the gene mutation because they have only one X chromosome) and (2) in females who are [[Zygosity|homozygous]] for the gene mutation (''i.e.'', they have a copy of the gene mutation on each of their two X chromosomes).
X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes, while males have one X and one [[Y chromosome]]. Carrier females who have only one copy of the [[mutation]] do not usually express the [[phenotype]], although differences in X chromosome inactivation can lead to varying degrees of clinical expression in carrier females.
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