• synonyms


[het-er-uh-zahy-goht, -zig-oht]
noun Genetics.
  1. a hybrid containing genes for two unlike forms of a characteristic, and therefore not breeding true to type.
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Origin of heterozygote

First recorded in 1900–05; hetero- + zygote
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for heterozygote

Historical Examples

  • If the individual was really a heterozygote, approximately fifty per cent.

    Being Well-Born

    Michael F. Guyer

  • Eosin is allelomorphic to white and the white-eosin compound or heterozygote has the color of the eosin male.

  • In this character, then, dominance almost always fails to show itself in the heterozygote and often fails in pure dominants.

  • Some are probably matings of two heterozygotes, others of two recessives, and others still of a recessive with a heterozygote.

  • But in a heterozygote potency is usually more or less reduced.

British Dictionary definitions for heterozygote


  1. an animal or plant that is heterozygous; a hybridCompare homozygote
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Derived Formsheterozygosis, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

heterozygote in Medicine


  1. An organism that has different alleles at a particular gene locus on homologous chromosomes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.