High frequency of recombination strain
During conjugation, the Hfr bacterium would likely transfer its entire DNA to the F-bacterium. However, since the mating bridge is structurally fragile the genetic transfer is usually incomplete. Hence, the recipient bacterium may only receive a portion of, and rarely the entire, bacterial genome of the donor Hfr bacterium.
Abbreviation: Hfr strain
Compare (with other groups of bacteria in terms of F factor):