高中生物第三章中“世代交替”的有关内容,在“教学大纲”中没作要求,因此,如何处理这部分教材,各地各不相同,有的“上”,有的不“上”。下面我想就这个问题谈谈我的一些看法及本人课堂实施的具体情况。“世代交替”的内容是安排在“减数分裂与有性生殖细胞的成熟”之后,紧接着是“高等植物的个体发育”。“减数分裂与有性生殖细胞的成熟”既是全章的重点之一,也是全书的重点内容之一。教材中是以动物为例来阐述其精子和卵细胞的形成过程的。动物的精子和卵细胞的形成过程有两个 Therefore, how to deal with this part of the textbook is different from place to place, and some of them are “upper” or “not upper”. Now I want to talk about some of my views on this issue and the specific circumstances of the implementation of my class. The “alternation of generations” is arranged after “the maturation of meiosis and sexual germ cells,” followed by “individual development of higher plants.” “Meiosis and sexual germ cells mature” is not only one of the focus of the whole chapter, but also one of the key content of the book. The textbook is based on animals as an example to illustrate the process of sperm and egg cell formation. There are two animal sperm and egg cell processes