Final answer:
Transposition refers to the movement of genetic elements called transposons or transposable elements. They can move within a DNA molecule, from one DNA molecule to another, or even from one cell to another, introducing genetic diversity in the process.
Step-by-step explanation:
Transposition refers to the movement of genetic elements called transposons or transposable elements. These are molecules of DNA that can independently excise from one location in a DNA molecule and integrate into another location. Transposons were discovered in the 1940s by American geneticist Barbara McClintock and have since been found in all types of organisms. They can move within a DNA molecule, from one DNA molecule to another, or even from one cell to another, introducing genetic diversity in the process.