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

群内进
杂交的

以两
方向进
杂交的
繁殖后代要多,因此为了产生无生机的杂
,就要消耗掉
些配子。

;
马;


