Biology / Bio 1525 · Atom · ~20 seconds
PCR: Amplifying a Target DNA Sequence
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PCR amplifies one specific DNA region into many copies, using primers flanking the target and a heat-stable DNA polymerase.
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Two short primers bind opposite ends of the target sequence, and repeated heating and cooling cycles copy that stretch exponentially.
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PCR amplifies only the sequence its primers flank — it does not copy the whole genome indiscriminately.