A genetic condition where there is only one copy of a gene in an otherwise diploid cell or organism.


For example, a copy of a gene that is deleted will result in hemizygosity in a diploid cell or organism. Hemizygosity is also displayed in human males where there is only one X chromosome (as the other sex chromosome is a Y chromosome). In another example, male honeybees are hemizygous as they develop from unfertilized eggs (unlike female honeybees that develop from fertilized eggs and thus have two sets of genes).

Word origin: Greek hēmi- half + zygosity.
Related forms: hemizygous (adjective)

Compare: homozygosity, heterozygosity
See also: zygosity

Please contribute to this project, if you have more information about this term feel free to edit this page

This page was last modified on 20 May 2009, at 08:25. This page has been accessed 13,843 times. 
What links here | Related changes | Permanent link