微演化(英语:Microevolution),又译为微观演化,指一个族群经过少许几个世代之后,产生的小尺度等位基因频率改变,其变异程度为物种或物种以下[1]。此变异可能会经过一些过程:突变、天择、基因流、基因漂变以及非随机交配。
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