Reference sources: 1  Petwave.com â Obesity Problems. 2  Petwave.com â Dogs Health. 3  Petwave.com â Cancer Types.  Dog Time.com â 10 Most Serious Pet Diseases.
Only a small sample of cells is needed for DNA fingerprinting. A drop of blood or the root of a hair contains enough DNA for testing. Semen, hair, or skin scrapings are often used in criminal investigations. A person who has DNA fingerprinting done voluntarily usually provides a sample of blood taken from a vein.
OK, so what DNA fingerprinting does is it looks for differences in the DNA that change where these restriction enzymes can cut DNA. The pattern of DNA fragments is then compared and if the child's DNA looks like a combination of the two parents' DNA, then the child is theirs.