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如图是一个基因型为MMNn的哺乳动物体内部分细胞的分裂示意图。下列叙述正确的是 A.图中属于有丝分裂时期的图象是甲、丙、丁 B.图乙、丙所示的细胞含有两个染色体组,图甲、丁所示的细胞中不具有同源染色体 C.图乙、丁所示的细胞分裂过程中有等位基因分离 D.图丁所示的细胞的基因型为MmNN,说明该细胞在此之前发生了基因突变或交叉互换
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