Final answer:
Transposons are genetic elements that can move within DNA. Each transposon carries DNA sequences recognized by its own transposase enzyme, which is necessary for transposition. Transposons can introduce genetic diversity by altering gene activation or inactivation.
Step-by-step explanation:
Transposons are genetic elements that can move within a DNA molecule or between DNA molecules. Each transposon carries DNA sequences that are recognized by its own transposase enzyme. Transposase is necessary for the transposon to excise from one location in the DNA and integrate into another location through a process called transposition. Transposons have been found in all types of organisms and can introduce genetic diversity by altering gene activation or inactivation.