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Meaning of introgression

in•tro•gres•sion

Pronunciation: (in"tru-gresh'un), [key]
— n. Genetics.
  1. 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
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.