Polymerase Chain Reaction (PCR To make multiple copies of a piece of DNA enzymatically 。Used to Clone DNA for recombination Amplify DNA to detectable levels ·Sequence DNA Diagnose genetic disease 。Detect pathogens • To make multiple copies of a piece of DNA enzymatically • Used to • Clone DNA for recombination • Amplify DNA to detectable levels • Sequence DNA • Diagnose genetic disease • Detect pathogens Polymerase Chain Reaction (PCR)