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图甲表示某二倍体动物精原细胞通过减数分裂形成精子的过程中某结构的数量变化曲线;图乙表示与该精原细胞有关的不同分裂时期的图象.请据图回答问题. (1)图甲曲线C点加倍是由于 1 ,使姐妹染色体分开成两个染色体;曲线B点后的细胞名称是 2 。 (2)图乙细胞A处于 3 分裂 4 期,细胞中含有 5 个染色体。 (3)图乙处于图甲曲线的 6 段,该细胞中含有 7 个染色单体,该细胞分裂形成的2个子细胞各有 8 个核DNA。 (4)图,细胞A与细胞B是否都含有同源染色体? 9 。
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