In Generalized Transduction, a Phage Introduces a Segment of Donor

Multiple Choice

In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?

A) degradation of one of the two strands of phage genome
B) circularization of the donor fragment before recombination
C) a single crossover between the donor segment and the recipient chromosome
D) a pair (or even number) of crossovers between the donor segment and the recipient
E) replication of the donor segment before recombination