Dictionary  in•tro•gres•sionPronunciation: (in"tru-gresh'un), [key] —n. Genetics. the introduction of genes from one species into the gene pool of another species, occurring when matings between the two produce fertile hybrids. Also called in•tro•gres'sive hybridiza'tion Pronunciation: (in"tru-gres'iv). [key] Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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