introgression

[ in-truh-gresh-uh n ]
/ ˌɪn trəˈgrɛʃ ən /

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 in·tro·gres·sive hybridiza·tion [in-truh-gres-iv] /ˌɪn trəˈgrɛs ɪv/.

Origin of introgression

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

British Dictionary definitions for introgression

introgression
/ (ˌɪntrəˈɡrɛʃən) /

noun

the introduction of genes from the gene pool of one species into that of another during hybridization