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.
Therefore, in DNA fingerprinting, fragments of DNA are extracted and a collection is created that is unique for each person. There are several techniques for doing so; they differ mainly in how the fragments are extracted and how they are converted into a form that can be analyzed for identification.