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| 有效群体大小在一个自然生物群体中，雌性和雄性的数量大致相等。而在畜牧业中，畜群中的公畜比母畜少得多，虽然畜群很大,在随机交配下，也像小的生物群体一样，有遗传漂移现象。因此在这类畜群中应计算有效群体大小 | |||
| 有效种群大小 | |||
| 有效群体大小 | |||
| effective population size: 1 phrase in 1 subject |
| Agriculture | 1 |
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