NEET 2012 Biology question

What is it that forms the basis of DNA fingerprinting ?

(1)Satellite DNA occurring as highly repeated short DNA segmentsCorrect
(2)The relative proportions of purines and pyrimidines in DNA
(3)The relative difference in the DNA occurrence in blood, skin and saliva
(4)The relative amount of DNA in the ridges and grooves of the fingerprints

Answer: (1)

Solution

DNA fingerprinting (Alec Jeffreys) is based on polymorphism in repetitive DNA, especially satellite DNA (minisatellites/VNTRs) made of short sequences repeated many times. The number of repeats at a locus differs between individuals, so the pattern of bands obtained after restriction digestion, electrophoresis and

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Question ID VK-091050