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張妤自然｜把複雜變簡單｜ 國高中線上課程🔬 on Instagram: "染色體、DNA、基因的關係 🔬🧬 📢 染色體、DNA、基因到底怎麼分？ 考試最愛考這三者的層級關係， 記住以下概念就不會混淆！ 📌 1. 層級關係：誰包含誰？ ✔ 染色體：由 DNA 纏繞蛋白質（組蛋白）組成 ✔ DNA（去氧核醣核酸）：一條很長的雙股螺旋分子，存放遺傳資訊 ✔ 基因：DNA 上的特定片段，決定個體的性狀 📌 簡單記憶法：「染色體 > DNA > 基因」 染色體是 DNA纏繞蛋白質形成的大結構 DNA是遺傳物質，負責存放基因資訊 基因是 DNA 上的一段特定片段，控制個別性狀 📌 2. 同種生物的染色體數目相同 ✔ 同一物種的細胞核內染色體數目一定相同 ✔ 例子： 人類：46 條（23 對） 果蠅：8 條（4 對） 📌 考試提醒 同物種染色體數目固定，但基因表現可能不同 物種不同，染色體數目未必相同 （不是染色體多就比較聰明或高等！） 📌 3. 同源染色體與等位基因 ✔ 同源染色體 成對的染色體，來自父母各一條（大小相同） 上面含有相同性狀的基因位置（但可能表現不同） ✔ 等位基
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張妤自然｜把複雜變簡單｜ 國高中線上課程🔬 on Instagram: "染色體、DN…
20K viewsMar 17, 2025
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