又称随机遗传漂变。指由于偶然发生的变动而造成下一代的基因频率不同于这一代的现象。
基因漂变甚至可以抵消自然选择。
毫无疑问，人类与猿猴之间以及不同人群之间的大部分基因差异都是因为基因漂变而产生。
There is no doubt that most of the genetic differences between humans and other apes – and between different human populations – are due to genetic drift.
虽然任何中立变异随机传播的可能性很小，每一代个体产生的大量变异却使基因漂变具备显著的力量。
Although the likelihood of any neutral mutation spreading by chance is tiny, the enormous number of mutations in each generation makes genetic drift a significant force.
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