The word mutation is derived from Latin wont mutatus means a change; ion means result of a process. Mutation is a heritable change in the kind structure, sequence or number of the component part of a DNA molecule. Mutations the original source of genetic variation. It may be harmful or beneficial for an individual. Due to harmful mutation, the forthcoming to generation are less adaptive than their parental generation.
As a result of natural selection, the frequency of genes of non-adaptive value is greatly reduced leading to diminished diversity and diminished adaptivity to further changes,