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Which of the following forms the basis of DNA Finger printing?

1. The relative proportions of purines and pyrimidines in DNA.
2. Satellite DNA occurring as highly repeated short DNA segments.
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.

Correct answer: Satellite DNA occurring as highly repeated short DNA segments.

Solution

DNA fingerprinting is based on polymorphisms in satellite DNA, especially short tandem repeats, which are highly repeated and vary in number between individuals. These differences create unique banding patterns after analysis.

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