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). Although it is much rarer, a girl can have DMD (by several different
means as, for example, if she has the DMD gene on both her X chromosomes and so is
homozygous for DMD).
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