It would be frameshift mutation.
An insertion or deletion in a DNA sequence that affects how the sequence is read and causes premature translation termination at a new nonsense or chain termination codon is known as a frameshift mutation (TAA, TAG, and TGA). A chain of numerous smaller molecules known as nucleotides makes up a DNA sequence. Insertion mutations and deletion mutations are the two forms of frameshift mutations that might occur.
Both have a similar overall impact, shifting the translational reading frame out of alignment and producing a random amino acid sequence. One of the most harmful modifications to a protein's coding sequence is a frameshift mutation. They are quite likely to cause significant changes in the chemical makeup and length of polypeptides, which will result in a protein that is no longer functional.
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