introgressive


in·tro·gres·sion

I0208550 (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.
[From Latin intrōgressus, past participle of intrōgredī, to step in : intrō-, intro- + gradī, to step; see ghredh- in Indo-European roots.]
in′tro·gres′sive (-grĕs′ĭv) adj.

introgressive

(ˌɪntrəˈɡrɛsɪv) adj (Genetics) genetics resulting from, marked by, or bringing about introgression