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(1) Characterized by having one or more genes without allelic counterparts.

(2) Pertaining to a diploid cell with only one copy of a gene instead of the usual two copies.


For example, the male is hemizygous for most X chromosome genes.

Word origin: Greek hēmi- half.
Related forms: hemizygosity (noun), hemizygote (noun).

Compare: homozygous, heterozygous