减数分裂第一次细胞分裂的主要特点是                  

 减数分裂第一次细胞分裂的主要特点是                                    

A. 姐妹染色单体彼此分开            B. 同源染色体彼此分开

C. 染色体进行复制                  D. 染色体恢复成染色质

答案

B

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