MOBILE GENES. “A transposable element (TE or transposon) is a DNA sequence that can change its position within a genome, sometimes creating or reversing mutations and altering the cell’s genetic identity and genome size. Transposition often results in duplication of the same genetic material. Barbara McClintock’s discovery of these jumping genes earned her a Nobel Prize in 1983.”
https://en.m.wikipedia.org/wiki/Transposable_element