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May 21, 2013
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Definition of Hemizygous

Hemizygous: Having only a single copy of a gene instead of the customary two copies. All the genes on the single X chromosome in the male are 'hemizygous.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=3687
Last Editorial Review: 3/19/2012

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