Much change is due to random genetic drift rather than positive selection.

许多生物变化源于基因的随机漂变而非主动选择.

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Random genetic drift has certainly played a big role in human evolution.

随机遗传漂变在人类进化过程中无疑起到了很大的作用.

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The unflattering answer could be for no other reason than random genetic drift.

最佳答案是基因的随机变异,它一点儿不讨人喜欢.

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