... known as a VNTR pattern. VNTR patterns are strands of DNA that apparently supply no relevant information to an organism's development. VNTR's 'variable number tandem repeats' can contain as many as a hundred base pairs. Every human being has some VNTRs and to determine if a person has a particular VNTR pattern a sequence of tests are carried out on a sample of DNA including, southern blot, radioactive probing and a hybridisation reaction to create the 'DNA fingerprint'. VNTR patterns are inherited genetically therefore a given persons VNTR pattern is more or less unique and varies a great deal between humans. This makes it possible to determine whether a particular sequence of DNA belongs to a person or not. Scientists analyse this short code of DNA by first isolating the DNA from a sample such as a bloodstain, skin epithelium, or even a single hair. The DNA can be isolated chemically ...

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