Tax season discounts available now. DNA paternity testing determines the biological father of a child. We all inherit our DNA from our biological parents â half from our mother and half from our father. A DNA paternity test compares a childâs DNA pattern with that of the assumed father to determine if there is a match.
1 Mutations are changes in the DNA. 2  A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. 3  Gene flow is any movement of genes from one population to another and is an important source of genetic variation.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: 1  Mutations are changes in the DNA.
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population. Because of this, mutations are usually selected against through evolutionary processes.Gene flow is the movement of genetic information between different populations. This method increases genetic variation because introducing new alleles into a population increases the amount of diversity.ecause of this, mutations are usually selected against through evolutionary processes. Gene flow is the movement of genetic information between different populations. This method increases genetic variation because introducing new alleles into a population increases the amount of diversity.