introgression

詳細解釋：

in.tro.gres.sion

n.（名詞）
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.
基因滲入：一物種的基因通過不斷地與另一物種基因的親代種間逆向雜交，而滲透進另一物種基因庫的過程

來源：
From Latin intrôgressus [past participle of] intrôgredo [to step in]
源自 拉丁語 intrôgressus [] intrôgredo的過去分詞 [進入]
intrô- [intro-]
intrô- [前綴，表.在…內部.]
grado [to step] * see ingress
grado [跨步] *參見 ingress

【引伸】
in.trogres.sive