1、
自交不亲和是被子植物预防近亲繁殖和保持 遗传 变异的一种重要机制.
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2、
The fix F suggests that A. is nearly outcrossing while the other two are marly inbreeding.
固定F表明华中铁角蕨接近随机交配,而另外两个种为近交.
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3、
4、
Outcrossing is the mating of two dogs of the same breed that are otherwise virtually unrelated.
同系繁殖是指交配犬只双方属于同一品种但没有实质上的联系.
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5、
Rice is a self-pollinated crops, flower structure and not for self-help outcrossing.
水稻是自花授粉作物，花器构造适于自交而不利于异交。
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