Question

Whys is genetic variation necessary to the process of natural selection?

What processes provide genetic variation and how do they work?

Answer 1

Genetic variation causes changes in phenotype. These variations are caused due to mutations. These mutations are seen in phenotypes. The favourable ones survive, and pass on to next generation while the ones which are unfavourable are ruled out.

These mutations over the course of time, cause natural selection , by selecting preferably fit species from the rest of population.

Genetic variations are caused due to mutations, recombinations , crossing over ,gene flow between the populations and sexual reproduction.

Mutations can be harmful or beneficial and both the types of mutations are heritable. Gene flow between the populations increase the variation whereas an isolated population is subjected to inbreeding anf amplification of harmful mutations.

The organisma who sexually reproduce have higher degree of variations as their distribution of chromosomes lead to division og characters in their progenies.