微演化(英語:Microevolution),又譯為微觀演化,指一個族群經過少許幾個世代之後,產生的小尺度等位基因頻率改變,其變異程度為物種或物種以下[1]。此變異可能會經過一些過程:突變、天擇、基因流、基因漂變以及非隨機交配。
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