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【单选题】
如果实验结果显示20个子囊中有5个子囊是交换型，15个子囊是非交换类型，那么这一基因与着丝粒之间距离的计算结果是________。A.
12.5 cM
B.
25 cM
C.
15 cM
D.
50 cM
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A.
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B.
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C.
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D.
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