Mutation - DNA
When a cell divides, it makes a copy of its DNA — and sometimes the copy is not quite perfect. That small difference from the original DNA sequence is a mutation.
Mutation (2 of 4) Insertion
Insertions are mutations in which extra base pairs are inserted into a new place in the genes.
Mutation (3 of 4) Deletion
Deletions are mutations in which a section of genes is lost, or deleted.