in·tro·gres·sion ( n tr -gr sh n)n. Infiltration of the genes of one species into the gene pool of another through repeated backcrossing of an interspecific hybrid with one of its parents. [From Latin intr  gressus, past participle of intrgred , to step in : intr-, intro- + grad, to step; see ghredh- in Indo-European roots.]in tro·gressive (-grsv) adj. |
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