A heritable genetic change in the genetic material of an organism that gives rise to alternate form of any gene is called mutation.
The process by which mutations is produced is called mutagenesis.
An organism exhibiting a novel phenotype as a result of the presence of a mutation is referred to as a mutant.
In broad sense, the term mutation include all types of heritable genetic change in chromosome number, chromosomal aberra and change in chemistry of genes.
Mutation is a sudden,irreversible and random change in the genotype of an organism which leads to phenotypic change in that organism.It can be controlled by both extrinsic and intrinsic factors.