An Hfr strain is produced when
A) an F episome integrates into the E. coli chormosome.
B) an F episome leaves the E. coli chromosome.
C) an F episome is transferred to a new cell.
D) an F episome leaves the host chromosome and removes some of the host chromosome.

Question

Quizplus · Accepted Answer

An Hfr (High frequency of recombination) strain is produced when the F episome integrates into the E. coli chromosome, resulting in the transfer of part of the host chromosome along with the episome during conjugation. This integration makes the transfer of the entire episome less efficient and increases the frequency of recombination between the donor and recipient cells.

An Hfr Strain Is Produced When