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DNA Testing - Paternity DNA Testing

 

Genetic fingerprinting, DNA testing, DNA typing, and DNA profiling are techniques used to distinguish between individuals of the same species using only samples of their DNA. Its invention by Sir Alec Jeffreys at the University of Leicester was announced in 1985. Two humans will have the vast majority of their DNA sequence in common. Genetic fingerprinting exploits highly variable repeating sequences called microsatellites. Two unrelated humans will be likely to have different numbers of microsatellites at a given locus. By using PCR to detect the number of repeats at several loci, it is possible to establish a match that is extremely unlikely to have arisen by coincidence, except in the case of identical twins, who will have identical genetic profiles.
 

DNA testing and genetic fingerprinting is used today in a wide variety of situations, and the opportunities for application are continuing to expand. One of the most popularly known uses of DNA testing is in the field of forensic science. Trace evidence containing DNA is collected at a crime scene. The DNA fingerprinting process then compares the crime scene DNA to that of suspects. It has also been used to generate hypotheses on the pattern of the human diaspora in prehistoric times.

Testing is subject to the legal code of the jurisdiction in which it is performed. Usually the testing is voluntary, but it can be made compulsory by such instruments as a search warrant or court order. Several jurisdictions have also begun to assemble databases containing DNA information of convicts.

The United Kingdom currently has the most extensive DNA database in the world, with well over 2 million records as of 2005: The National DNA Database (NDNAD). The size of this database, and its rate of growth, is giving concern to civil liberties groups in the UK, where police have wide-ranging powers to take samples and retain them even in the event of acquittal.

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