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hemizygosity

[ hĕm′ĭ-zī-gŏsĭ-tē ]
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n.
The state of having unpaired genes in an otherwise diploid cell; men are normally hemizygous for the genes on the X-chromosome.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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