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减数分裂是重要的生物学基础知识。掌握好有丝分裂知识是学好减数分裂的基础,而有丝分裂和减数分裂的知识又是学好生物生殖、发育和遗传三大规律的基础。为了提高复习质量和效果,使学生更好地掌握全面的知识,应以有丝分裂和减数分裂过程的染色体和DNA的变化为中心,进行联系比较。 1.用各期变化数据比较: 果蝇体细胞进行有丝分裂时,染色体、染色单体、DNA分子数在各期中的变化数据如下:
Meiosis is an important biological basis. Mastering mitosis knowledge is the basis for learning how to reduce meiosis, and the knowledge of mitosis and meiosis is the basis for learning three major laws of biological reproduction, development and inheritance. In order to improve the quality and effectiveness of review, and to enable students to acquire a comprehensive knowledge, a comparison should be made about changes in chromosomes and DNA during mitosis and meiosis. 1. Using the data of different periods of change: When the Drosophila somatic cell carries on mitosis, the change data of chromosome, chromatid and DNA molecule in each period are as follows: