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DNA fingerprinting relies mainly on the variation between individuals in their:
ABulk genomic DNA that is 99% identical
BVariable number of tandem repeat sequences
CNumber of chromosomes per cell
DTotal length of messenger RNA
Answer & Solution
Correct answer: B. Variable number of tandem repeat sequences
1. About 99% of human DNA sequence (bulk genomic DNA) is the same in all people.
2. The variation used for identification lies in the remaining 1%, present as repeated satellite DNA.
3. The differing number of copies, called variable number of tandem repeats (VNTRs), serves as the molecular marker.
4. Option A describes the identical part, so it cannot distinguish individuals, making it a trap.
5. Hence the answer is B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.301_
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