(of a species or individual organism) having two unlike gametes.
Origin of heterogametic
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Producing dissimilar gametes, such as those of human males, who produce two types of spermatozoa, one bearing the X-chromosome and the other bearing the Y-chromosome.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.