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【单选题】
已知用 P1 进行普遍性转导,供体 E.coli 细胞的基因型为 trpC + pyrF ˉ trpA ˉ ,受体基因型为 trpC ˉ pyrF + trpA + ,用 trpC + 进行选择,结果如下: 基因型 数目 trpC + pyrF ˉ trpA ˉ 279 trpC + pyrF + trpA ˉ 279 trpC + pyrF ˉ trpA + 2 trpC + pyrF + trpA + 46
A.
trpC 与 pyrF 的距离较近， 与 trpA 的距离较远
B.
trpC 与 pyrF 的距离较远， 与 trpA 的距离较近
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