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explain about V N T R?

The full form of  VNTRs is variable number of tandem repeats. They are a family of genetic loci found in eukaryotes which include short (about 15-100 bp long) sequences of DNA repeated in tandem arrays. These tandem arrays are typically 15 kb long in humans. The VNTR loci add on to  to repetitive DNA, and are significantly  useful in DNA fingerprinting. This is because each VNTR locus typically has many different alleles. Therefore, it is a very rare possibility that two individuals can exist  having identical sets of alleles for even a few such loci . Hence, these VNTRs sequences are unique to every individual and thus are  used to establish identity of a person by a process called DNA fingrprinting.

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VNTR -  Variable  number tendon repeats 
it's a technique that can be used to ascertain  parentage .
Such repeated sequences facilitate the genetic fingerprinting of individuals. For example, an individual may inherit a certain number of repeats at one locus from their mother, and a different number of repeats at the same locus, from their father. Through PCR amplification of material between conserved sites on either side of the VNTR locus, one can obtain a banding pattern of the products on a gel. 
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