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[求助] 考研学生求助高频转导问题

高频转导书上是这样描述的,以λ噬菌体为例,用高moi的LFT感染受体菌,然后会形成双重溶源菌,诱导双重溶源菌发生裂解,裂解物里一半是正常的λ噬菌体,一半是带有供体菌基因的λ噬菌体。用低moi的HFT感染受体菌,可以获得50%的局限转导子。我想问的是,因为LFT里有供体菌基因的λ噬菌体是低频的,因此感染受体菌后双重溶源菌很少,意味着大部分受体菌都感染的是正常的噬菌体,然后UV诱导后裂解,尽管对于双重溶源菌来说正常与非正常是1:1,但其余大量正常溶源菌也裂解释放大量正常噬菌体,那这样带有供体菌基因的λ噬菌体就更少了,再用这些HFT感染受体菌,怎么会产生50%的局限转导子呢?  求各位大哥大姐解答下

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