Assertion: Transposition starts by forming a strand transfer complex in which the transposon is connected to the target site through one strand at each end. Reason: Replicative Transposition Proceeds through a Cointegrate.

A and R both are correct and R is not correct explanation of A. Transposition starts by forming a strand transfer complex in which the transposon is connected to the target site through one strand at each end. Replicative Transposition Proceeds through a Cointegrate. Replication of a strand transfer complex generates a cointegrate, which is a fusion of the donor and target replicons. The cointegrate has two copies of the transposon, which lie between the original replicons. Recombination between the transposon copies regenerates the original replicons, but the recipient has gained a copy of the transposon.