what are three sources of genetic variation
Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about:1  Mutations are changes in the DNA. 2  Gene flow is any movement of genes from one population to another and is an important source of genetic variation. 3  Sex can introduce new gene combinations into a population.ithout genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about: