a generalized transducing phage is used to transduce an abcde recipient strain of e. coli
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A cross is made between two E. coli strains: (Hfr arg+ bio+ leu+) x (F− arg− bio− leu−). ... Five Hfr strains A through E are derived from a single F+strain of E. coli. The following chart shows the entry times of the first five markers into an F− strain when each is used in an interrupted-conjugation experiment: a.
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