dna fingerprinting

Question

Variable number tandem repeats (VNTRs) are useful because they:

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1. **Nature of VNTR**: These are short sequences of DNA (satellite DNA) that repeat multiple times in tandem at specific locations on chromosomes.
2. **Polymorphism**: The number of repeats varies significantly from person to person (except between monozygotic twins).
3. **Application**: Because the number of repeats (and thus the length of the fragment) is different, comparing these **length polymorphisms** allows scientists to uniquely identify individuals.
4. **Mechanism**: DNA fingerprinting uses VNTRs as probes to create unique patterns of bands on a gel.

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