| − | A radical chemical change in one or more [[allele]]s of an [[organism]].
| + | Merriam-Webster's online dictionary defines a '''mutation''' as "a relatively permanent change in hereditary material involving either a physical change in [[chromosome]] relations or a biochemical change in the [[codons]] that make up [[Gene|genes]]; also : the process of producing a mutation." [http://www.m-w.com/dictionary/mutation] |