point mutation is the type of mutation which occur due to change in

1. number of chromosome
2. nucleotide sequence of gene
3. chromosome as a whole
4. arrangement of gene

Hello Student
Correct Answer is 2.nucleotide sequence of gene
When heritable alterations occur in a very small segment of DNA molecules , I.e. single nucleotide or nucleotide pair, this type of mutation is called point nutation. This mutation leads to change in nucleotide sequence of a gene.