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This Technique is used to (1) identify criminals in forensic laboratories (2) determine paternity-maternity disputes i.e who is the true biological father or mother of the child 
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It is the method of ascertaining relationship and the identity of a person by means of banding pattern of DNA fragments.It is also called DNA typing or DNA profiling or genetic fingerprinting.It was invented by Sir Alec Jeffrey in 1985.
 Some important techniques:
*Southern blotting technique:It is a technique used to detect even minute quantities of DNA.
*Northern blotting technique:It is a technique for the identification of RNA molecules.It is also a good technique for determining the number of genes present on a given DNA.
*Western blotting technique:It is a technique used to detect proteins in a given sample.It is very useful to understand the nucleic acid functions
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