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The basis for DNA fingerprinting is

1. occurrence of restriction fragment length polymorphism (RFLP)
2. phenotypic differences between individuals
3. availability of cloned DNA
4. knowledge of human karyotype

Correct answer: occurrence of restriction fragment length polymorphism (RFLP)

Solution

DNA fingerprinting works because individuals often differ in the lengths of DNA fragments produced by restriction enzyme digestion. These differences are called restriction fragment length polymorphisms (RFLPs), which create unique banding patterns.

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