染色体.DNA.染色单体
间期.减1(前期.中期后期末期)减2(前期.中期后期末期)分别为：
2n,4n.4n
2n,4n,4n;2n,4n,4n;2n,4n,4n;n,2n,2n;
n,2n,2n; n,2n,2n;2n,2n,0;n,n,0
给分吧,我辛辛苦苦打得