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有丝分裂是高中生物教学的重点内容,“观察根尖分生组织细胞有丝分裂实验”对学生理解有丝分裂各个时期染色体的行为变化有辅助作用,但是笔者和周边同事在教学中都普遍感到这个实验的成功率很低,所以笔者回顾大学所学内容并对比教材和多次教学实践情况,对此实验做了以下分析和优化,现表述如下:一、实验材料的分析和优化教材用洋葱(Allium cepa.2n=16),但根据实际情
Mitosis is the focus of high school biology teaching, “observation of apical meristem cell mitosis ” for students to understand the behavior of chromosomes during each period of mitosis changes in the role of ancillary, but the author and his colleagues in the teaching are generally felt that this experiment The success rate is very low, so I review the contents of the university and compare the teaching materials and teaching practice, made the following analysis and optimization of the experiment, are as follows: First, the analysis and optimization of experimental materials Teaching materials with onion (Allium cepa .2n = 16), but according to the actual situation