Answer :
Final answer:
The incorrect statement about Hfr strains of E.coli is 'In Hfr strains, the F factor is integrated into a plasmid'. In fact, the F factor is integrated into the main bacterial chromosome, which causes the high frequency of recombination.
Explanation:
The false statement among the ones provided concerning Hfr strains of E. coli is 'In Hfr strains, the F factor is integrated into a plasmid'. This is incorrect because in Hfr strains or High Frequency Recombination strains of E. coli, the F factor is indeed integrated, but into the main bacterial chromosome, not into a plasmid. It's this F factor integration into the main chromosome that allows for the high frequency of recombination.
The interrupted mating technique is accurately described for studying genetic exchange between Hfr and F- strains. The concept of gene mapping using the time of transfer of different marker genes is also correct.
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