When I first encountered the term genetic mutation, I envisioned a gene that had somehow spoiled – like an orange with mole on it. A little research indicated that a gene is a linear string of amino acids that codes for a protein. The term mutant gene was being used to indicate a gene in which there had been an alteration in the amino acids sequence that was coding for a protein. I have not been able to find anything on when it is not an insertion or a deletion within a sequence but the amino acid itself is misformed. Surely this happens. Is this just considered a deletion? Any information on the above would be appreciated.