AP BIOLOGY

Detailed explanation-1: -Simple, or conservative transposition, is a non-replicative mode of transposition. That is, in conservative transposition the transposon is completely removed from the genome and reintegrated into a new, non-homologous locus, the same genetic sequence is conserved throughout the entire process.

Detailed explanation-2: -DNA transposons move from one genomic location to another by a cut-and-paste mechanism. They are powerful forces of genetic change and have played a significant role in the evolution of many genomes.

Detailed explanation-3: -(ii) Cut-and-paste transposition: Excision. Many RNase H-like transposases catalyze“ non-replicative” or “cut-and-paste” transposition. These enzymes must generate DSBs at their transposon ends, the prerequisite for liberating the mobile element from its donor site.

Detailed explanation-4: -In replicative transposition, a transposable element is duplicated from the part of donor DNA (see Figure 4( On the other hand, in nonreplicative transposition, the element form donor DNA moves directly to recipient DNA (see Figure 4(b)).