Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Mutation is sudden, discontinuous variation in genotype and phenotype of an organism due to change in chromosomes and genes.In addition to recombination, mutation is another phenomenon that leads to variation in $\text{DNA}$. A point mutation is a change of a single base pair in $\text{DNA}$.Some mutations involve changes in the whole set of chromosomes $($polyploidy$)$ or change in a subset of chromosome number $($aneuploidy$)$. So, the material for organic evolution is mutation because mutation leads to evolution.