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实验六 动植物染色体标本的制备与观察

实验六 动植物染色体标本的制备与观察. 一、实验目的 学习动植物染色体标本的制备技术,掌握染色体计数和分析的方法。 二、实验用品 1 . 材料: 洋葱根尖、小鼠骨髓 2 . 试剂: Carnoy 固定液; 0.01 %秋水仙素;盐酸酒精离析液; 1% 醋酸洋红染液; Giemsa 染液; 0.4%KCl 低渗液; 2% 柠檬酸钠。. 1 .取材:切取 0.5cm 长的洋葱根尖部分。 2 .预处理: 0.1 %秋水仙素液室温处理 3-4h 。 3 .固定: Carnoy 固定 2-24h , 70 %酒精保存。

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实验六 动植物染色体标本的制备与观察

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  1. 实验六 动植物染色体标本的制备与观察

  2. 一、实验目的 • 学习动植物染色体标本的制备技术,掌握染色体计数和分析的方法。 • 二、实验用品 • 1 .材料:洋葱根尖、小鼠骨髓 • 2 .试剂:Carnoy固定液;0.01%秋水仙素;盐酸酒精离析液;1%醋酸洋红染液; Giemsa染液;0.4%KCl低渗液;2%柠檬酸钠。

  3. 1 .取材:切取0.5cm长的洋葱根尖部分。 2 .预处理:0.1%秋水仙素液室温处理3-4h。 3.固定:Carnoy固定2-24h,70%酒精保存。 4 .水解:盐酸酒精离析液,60℃,3-5min。清水漂洗两次,每次5分钟。 5.染色:1%醋酸洋红染色10-20min,压片 6 .观察。 三、洋葱根尖压片实验步骤

  4. 四、小鼠骨髓染色体制备 • 1 .腹腔注射0.01%秋水仙素1ml处理3-4h; • 2 .处死小鼠,取出股骨; • 3.剪去两端骨骺,1ml2%柠檬酸钠冲出骨髓; • 4 .吹打,加9ml 0.4%KCl低渗10-30min; • 5.离心弃上清液,加5mlCannoy固定20min; • 6.滴片、烘烤干燥; • 7.Giemsa染色10min,流水冲洗; • 8.加盖玻片,观察和绘图。

  5. 五、实验结果核分析 • 绘图说明洋葱根尖有丝分裂的过程

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