What is happening during each cycle of PCR?

PCR is shorthand for a simple but very useful procedure in molecular biology called the polymerase chain reaction. It is a technique used to amplify a segment of DNA of interest or produce lots and lots of copies.

A DNA polymerase enzyme joins free DNA nucleotides together. ... The result of one cycle of PCR is two double-stranded sequences of target DNA, each containing one newly made strand and one original strand. The cycle is repeated many times (usually 20–30) as most processes using PCR need large quantities of DNA

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