Comment on the utility of variability in number of tandem repeats during DNA finger printing.

Explanation

Variable number tandem repeats (VNTR) are very useful in DNA fingerprinting and tracing the similarity or relationship between DNAs from different sources. The size of VNTRs varies from 0.1 to 20 kb depending upon the number of repeats. Hybridisation of an individual DNA’s VNTR with VNIR probes and preparing its autoradiogram provides bands of different sizes. The banding pattern differs from individual to individual in a population except in case of monozygotic twins which inhent identical hereditary material. The similar size and location of band in two DNAs can help in tracing the similanty between the two.