noun 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 introgressive hybridization [in-truh-gres-iv] .

1930–35 (earlier in literal sense of L); < Latin intrōgress(us), past participle of intrōgredī to go in, enter (intrō- intro- + -gred-, combining form of grad(ī) to proceed, walk + -tus past participle suffix, with -dt- > -ss-) + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
introgression (ˌɪntrəˈɡrɛʃən)
the introduction of genes from the gene pool of one species into that of another during hybridization

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Or, one or the other may have experienced introgression at that locus and so diverged after domestication.
Additionally, pre-sapient species likely had their own adaptations which could plausibly have jumped through introgression.
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