It is a technique used to amplify a segment of DNA of interest or produce lots and lots of copies. In other words, PCR enables you to produce millions of copies of a specific DNA sequence from an initially small sample – sometimes even a single copy.Click to see full answer. Regarding this, how does PCR make copies of DNA?The key element of PCR is heat. Throughout the PCR process, DNA is subjected to repeated heating and cooling cycles during which important chemical reactions occur. PCR makes it possible to produce millions of copies of a DNA sequence in a test tube in just a few hours, even with a very small initial amount of DNA.Subsequently, question is, what are the three main steps in the PCR process? The three steps of PCR are: Denaturation: Unwinding the double helix by heating to 95 degrees Celsius for 30 seconds. Annealing: Priming the DNA by cooling the test tube to 50 degrees Celsius for 30 seconds. Extension: Adding on complementary nucleotides and reheating to 72 degrees Celsius for 60 seconds. Also to know, which DNA is copied in PCR? Like DNA replication in an organism, PCR requires a DNA polymerase enzyme that makes new strands of DNA, using existing strands as templates. The DNA polymerase typically used in PCR is called Taq polymerase, after the heat-tolerant bacterium from which it was isolated (Thermus aquaticus).How does a PCR work?To amplify a segment of DNA using PCR, the sample is first heated so the DNA denatures, or separates into two pieces of single-stranded DNA. Next, an enzyme called “Taq polymerase” synthesizes – builds – two new strands of DNA, using the original strands as templates.