The right answer is insertion.
The insertion is, in genetics, the contribution of genetic material on a chromosome. This intake usually comes from another chromosome that is deletions.
Insertion can lead to changes in gene function: encoding nucleic bases in a gene makes it longer and shifts the reading of its data, which can modify its functioning in a harmful way, especially if the insertion occurs on the exon (the fragments of an RNA primary presence in cytoplasmic RNA after splicing).
