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Definition of Recessive, X-linked

Recessive, X-linked: A gene on the X chromosome that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, Duchenne muscular dystrophy (DMD) is an X-linked recessive disorder. A DMD boy has the DMD gene on his sole X chromosome (and so is said to be hemizygous for DMD). Some girls who are heterozygotes for DMD can have DMD features in older age .

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=5241
Last Editorial Review: 10/30/2013

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