define mutation for chemistry
A point mutation that changes a codon with the result that it codes for a different amino acid is called a missense mutation. Such a mutation can change the nature of the protein being formed. It can change the amino acid composition and the protein sequence and, therefore, the structure of that protein.
(my-tÄ'shÉn) A change in the structure of the genes or chromosomes of an organism. Mutations occurring in the reproductive cells, such as an egg or sperm, can be passed from one generation to the next. Most mutations occur in junk DNA and have no discernible effects on the survivability of an organism.