introgression

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Related to Genetic introgression: introgressive hybridization

introgression

(ĭn′trə-grĕsh′ən)
n.
The movement or spread of alleles of one species into the gene pool of another through repeated backcrossing of interspecific hybrids with members of one of the parental species.

in′tro·gres′sive (-grĕs′ĭv) adj.