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【单选题】
下面为细胞分裂过程中细胞核内DNA含量变化的曲线图，右图表示是某二倍体动物的一个细胞示意图。下列叙述正确的是（）A.
图中细胞是次级精母细胞，处于曲线图的c-d段时期
B.
该细胞的每个染色体组中有3条染色体，包含了该生物基因组中的全部DNA序列
C.
假设图中细胞表示某生物体细胞有丝分裂过程中的细胞图像，则该生物是单倍体
D.
若染色体②上有基因B，⑤的相同位点上有基因b，说明细胞在b-c段时期内发生了交叉互换
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