• 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 heterozygotes

Historical Examples of heterozygotes

  • Again, in F2 we see reappearing the high ancestral toe-numbers (practically lost in the heterozygotes of F1, table 12, b).

    Inheritance of Characteristics in Domestic Fowl

    Charles Benedict Davenport

  • Do the 4-toed heterozygotes produce a larger proportion of imperfect dominants in F2 than the 5-toed heterozygotes?

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

  • Next, the heterozygotes of F1 (table 46), may be appealed to; but they will give no critical answer.

British Dictionary definitions for heterozygotes


  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

heterozygotes 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.