inbreeding
noun [ U ] uk/ˌɪnˈbriː.dɪŋ/ us/ˈɪn.briː.dɪŋ/
近亲繁殖;近亲交配
a situation in which plants, animals, or people are produced by breeding between closely related plants, animals, or people
the dangers/effects of inbreeding 近亲繁殖的危险／后果