下列是有关细胞分裂的问题．图1表示细胞分裂的不同时期与每条染色体DNA含量变化的关系；图2表示处于细胞分裂不同时期的细胞图象，请回答：

（1）图1中AB段形成的原因是____ ，该过程发生于细胞分裂的____ 期，图1中CD段形成的原因是____ ．

（2）图2中____ 细胞处于图1中的BC段，图2中____ 细胞处于图1中的DE段．

（3）就图2乙分析可知，该细胞含有____ 条染色单体，染色体数与DNA分子数之比为____ ，该细胞处于____分裂后期．

（A）

Jiangmen Opera Booking Office

Time: Begin at 7:30 every evening( last(延续) 2 hours)

Place: Dadi Theatre,175 Yingbin Road

Tele: 15910740785

E-mail:book@jiangmenopera.com

The prices include snacks and tea.

    To buy tickets contact(联系) our office by e-mail or calling at 15910740785 during office hours in English or Chinese. You can book tickets by credit(信用) card through paypal (支付宝) or through banks. You must pay for the tickets in Bank of China as late as the day before the show.