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当群体中的某些遗传性状受到正向选择时,编码该性状的基因在群体中的频率提高或被固定,导致群体基因库中该基因及其紧密连锁区域的遗传多样性也随之降低的过程。
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fight or flight response
fight with weapons between groups of people
Fight Zhujiazhuang three times
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