But there is an equally important downside : inbreeding .
但是同样重要的，其不利面：近亲繁殖。
Inbreeding rate and its genetics effect in uygur of turpan .
吐鲁番市郊区维吾尔族的近亲结婚率及遗传学效应。
If the wolf population dwindles too much or if wolves survive only in isolated pockets inbreeding would endanger their future .
如果狼的数量逐渐变少-或者如果狼只能在孤立的小块地区生存-近亲繁殖将会危及他们的未来。
But in those nuclear families with higher levels of inbreeding , offspring had an estimated 5.4 percent reduction in fitness .
但是在那些存在高度近亲繁殖的核心家庭中，后代健康的几率估计下降了5.4%。
These survivors are all the progeny of just two males and four females , and display the lowered fertility and above-average infant mortality that goes with inbreeding .
