What is the definition of genetic variation

Genetiic variation is simply the different variety of   genetic make up  and what is called alleles. Alleles are similar to a code for the body which determines such things as hair color, eye color, height, and other factors. 

Genetic variation is therefore the variation between genes and alleles, within a small or large group of people. A small group of people would for example be a family. A large group of people would for example be  the population of a certain geographic region such as a country.

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