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细胞分裂的有丝分裂和减数分裂过程中涉及染色体数目和核内DNA分子数目的变化规律,其内容涉及微观领域,比较抽象,学生掌握和运用起来很容易混淆,也是学生学习的重点、难点知识,特别是减数分裂知识还是学习遗传与变异的基础。在连续几年有关染色体和DNA内容教学和高考备考中,采取了分析知识、认真比较、找出特点、利用图示等方法帮助学生理解、记忆。
The process of mitosis and meiosis in cell division involves the number of chromosomes and the number of DNA molecules in the nucleus. The content involves the microscopic field, which is quite abstract. It is easy for students to confuse and master them. It is also the focus of students’ learning, difficult knowledge, In particular, meiosis knowledge or learning genetic and mutation basis. In several years of teaching chromosomes and DNA content and college entrance examination preparation, taken to analyze the knowledge, serious comparison, to find out the characteristics of the use of pictorial methods to help students understand and remember.