漂变即遗传漂变由于群体太小使基因频率发生随机波动有时会丢失某基因而固定另一基因
Drift is genetic drift because the population is too small and there are random fluctuations in gene frequency and sometimes one gene is lost and another gene is fixed
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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