EPISODE · Jun 18, 2025 · 8 MIN
2025 biology talkshow : 遺傳變異的因子與分子機制 ( 選修生物I)
from 雷比特生物空中講 · host 雷比特老師
探討遺傳變異的成因，其定義為DNA序列的改變。說明變異可源於內源性過程，如DNA複製錯誤，但主要聚焦於外源性物理與化學因子如何顯著增加突變率。物理性誘變因子包括電離輻射，能直接造成DNA斷裂，以及紫外線，會形成胸腺嘧啶二聚體，兩者皆干擾DNA複製與修復。化學性誘變劑則涵蓋鹼基類似物、烷化劑、脫氨劑及插入劑，它們直接改變DNA鹼基結構，導致複製錯誤或阻礙。文末強調，若DNA損傷未有效修復，可能引發疾病或癌症，並提及相關修復機制及其在疾病中的作用。 Powered by Firstory Hosting
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2025 biology talkshow : 遺傳變異的因子與分子機制 ( 選修生物I)
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