outbreeding

The MHC is also thought to act as a proxy for general outbreeding, with all the hybrid vigour that can bring.

幸运的是，生物进化已经使哺乳动物拥有了利用体味辨别MTC差异度的能力。

There is also a general lowering of vigor in inbred stock (inbreeding depression), which is especially pronounced amongst normally outbreeding populations.

而杂合型出现的频降低，因而降低了种群基因的潜在可变。