2025 選修生物IV CH1-2 演化的隨機性與運氣存活-基因漂變 genetic drift

探討遺傳漂變（genetic drift）:一種與自然選擇並行的演化機制，它強調了隨機性在基因頻率變化中的作用。解釋遺傳漂變是基因頻率因偶然事件而改變，特別容易發生在族群規模較小的情況下。接著，闡述兩種導致小族群形成的關鍵效應：瓶頸效應（因災難導致族群數量銳減，如獵豹案例）和創始者效應（一小群個體離開原族群建立新族群，如南非阿非利卡人社群的亨丁頓舞蹈症案例）。這些機制會減少基因多樣性，並使得某些基因因「運氣」而非適應性被保留或擴大，最終揭示演化過程中「隨機性」所扮演的重要角色。 Powered by Firstory Hosting

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2025 選修生物IV CH1-2 演化的隨機性與運氣存活-基因漂變 genetic drift

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