[davidflora]

DNA Fingerprinting is a way of identifying a specific person.It has been around since 1985.DNA fingerprinting uses a specific type of DNA sequence, known as a microsatellite, to make identification much easier.DNA fingerprinting today is generally conducted short tandem repeat (STR) analysis; STR has supplanted an older technique called restriction fragment length polymorphism (RFLP) analysis.There are certain regions of the human genome where short sequences of two to five bases are repeated many times; these are called STRs.Using a process called polymerase chain reaction (PCR), investigators isolate specific STRs from a DNA sample, then separate them by size and compare them to the size of STRs in another sample to see whether the two samples are from the same person.
Thanks to PCR, even very small samples provide enough DNA for STR testing.