inviable

1.In postzygotic isolating mechanisms mating occur, but the resulting hybrid organism is inviable or sterile.

在合子后隔离，匹配可以进行，但或不产生或不育。

2.Individuals crossing exclusively within the same population produce more progeny than those crossing in both directions and thereby use up some of their gametes for the production of inviable hybrids.

完全在同一群内进行交个体比以两个方向进行交个体繁殖后代要多，因此为了产生无生，就要消耗掉一些配子。