DNA Fingerprinting

Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms and some viruses. The main role of DNA molecules is the long-term storage of information. DNA is often compared to a set of blueprints or a recipe, or a code, since it contains the instructions needed to construct other components of cells, such as proteins and RNA ,Ribonucleic acid a type of molecule that consists of a long chain of nucleotide (Organic compounds that consist of three joined structures: a nitrogenous base, a sugar, and a phosphate group) unit, molecules.
The DNA alphabet is made up of four building blocks – A, C, T and G, called base pairs, which are linked together in long chains to spell out the genetic words, or genes, which tell our cells what to do. The order in which these 4 DNA letters are used determines the meaning (function) of the words, or genes, that they spell.

DNA fingerprints finger prints from 6 different people (1 in each column)
DNA can be cut into shorter pieces by enzymes called restriction endonucleases. The pieces can then be separated according to there size on a gel.
Human DNA is 99% identical between individuals, but the 1% that differs enables scientists to distinguish identity.