关于有丝分裂和减数分裂末期染色体和DNA数目的变化,一直存在着争议,多数教师认为有丝分裂末期染色体数为2N(若生物正常体细胞染色体数为2N),因为多年来,人民教育出版社编辑出版的普通高中生物教师教学用书,一直把有丝分裂末期的染色体数定为2N,而有些教师却认为有丝分裂末期的染色体数应为4N→2N,少数教师还认为是4N.那么有丝分裂末期的染色体数到底是多少才正确呢?为此我们查阅了 There has been controversy over changes in the numbers of chromosomes and DNA at the end of mitosis and meiosis. Most teachers think that the number of chromosomes at the end of mitosis is 2N (if the number of chromosomes in a normal somatic cell is 2N), since many years have been edited and published by People’s Education Press Of ordinary high school biology teacher teaching book, has been set to the end of mitotic chromosome number 2N, while some teachers think that the end of mitotic chromosome number should be 4N → 2N, a few teachers also think it is 4N. The end of mitotic chromosome number exactly How much is correct? For this reason we checked