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细胞增殖是重要的细胞生命活动,是生物体生长、发育、繁殖和遗传的基础。细胞以分裂的方式进行增殖。因此,细胞分裂也成为近几年高考考查的重要内容之一。下面对该考点进行详细的分析。一、知识梳理1.有丝分裂与减数分裂的比较2.减数分裂产生配子种类的计算规律(1)精子形成过程中的规律①一个精原细胞能形成1个初级精母细胞、2个次级精母细胞、4个精子。②染色体为2N的一个精原细胞只能形成2种染色体组合的精子。③染色体为2N的精原细胞能形成2~N种染色体
Cell proliferation is an important cell life activity, which is the basis of organism growth, development, reproduction and inheritance. Cells proliferate in a split manner. Therefore, cell division has also become an important part of college entrance examination in recent years. The following test sites for a detailed analysis. First, the knowledge of combing 1. Comparison of mitosis and meiosis 2. Meiosis law of gametes species (1) the law of spermatogenesis ① a spermatogonia can form a primary spermatocyte, 2 times Grade spermatocytes, 4 sperm. ② chromosome 2N spermatogonia can only form two kinds of chromosome combinations of sperm. ③ chromosome 2N spermatogonia can form 2 to N chromosomes