With my regard , I hope my answer be useful , mutation is defined as any change in a DNA sequence away from normal. This implies there is a normal allele that is prevalent in the population and that the mutation changes this to a rare and abnormal variant. is induced from outside the cell: by an exogenous factor, is inheritable. Mutations result from errors during DNA replication or other types of damage to DNA, which then may undergo error-prone repair (especially microhomology-mediated end joining), or cause an error during other forms of repair, or else may cause an error during replication.
Mutations occur mainly in one or two individuals, and that is more often less than 1% of the population. Mutations may be or may not be harmful to the individual. polymorphism is a DNA sequence variation that is common in the population.Polymorphism is more often found in a population in common. Therefore, it occurs at least in 1% of the individuals of the population. Polymorphism also may be harmful to individuals or may not be. However, more often it is for the benefit of the individuals in a population to be better adapted to a particular environment.