Mating between F+ and F- bacterial strains mostly obtain F+ strains while mating between Hfr and F- strains obtain F- strains. This is because
The formation of a conjugation tube is a time-consuming process in Hfr strains.
F+ strains exhibit a lower rate of recombination.
Genes far from the point of origin are transferred first through the conjugation tube.
F factor is integrated into the chromosomes of Hfr strains.
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