Question

Les

Answer 1

The source of variations is mutation.

Option (a);

EXPLANATION:

Mutation can create a completely different allele of species and this means that the new version of genes will be created with the mutation. Genetic variation refers to the difference in genes within a population.

An organism's DNA  decides how that particular species looks or behaves. With the help of mutation, DNA of that organism is affected, thereby creating a different species altogether.

It is an important source of evolution as it affects the way that the body develops or works.

Answer 2

Answer:

Mutation

Explanation:

First, mutations of a gene give way to the different alleles of a gene. Then, crossing over, independent assortment, and random fertilization allow for further variation.