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.
In the field of biology, inherited variation refers to genes and genetic information transferring from both parents to offspring. Biological variation occurs in all species, including humans, plants and other animals. Offspring of all living species derives approximately 50 percent of each parent's genes, giving them resemblance to the parents while displaying novel traits, features and characteristics as well, as noted in a report by the BBC.