inbreeding
  同系繁殖,近親交配
  in·breed·ing /ˈɪnˈbrɪdɪŋ/ 名詞
  近交,近(親)交(配),同系交配
  In·breed v. t. [imp. & p. p. Inbred p. pr. & vb. n. Inbreeding.]
  1. To produce or generate within.
     To inbreed and cherish . . . the seeds of virtue.   --Milton.
  2. To breed in and in. See under Breed, v. i.
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  inbreeding
       n : the act of mating closely related individuals