DNA sample is mixed with DNA nucleotides and DNA polymerase enzyme
Heated to 95 degrees celcius to break H. bonds = becomes single stranded
Primers added (as DNA polymerase cannot bond directly to single stranded DNA)
Cooled to 55 degrees celcius
Primers bind (H. bonds) = now double stranded DNA at both ends
DNA polymerase binds to double stranded sections
Heated to 72 degrees celcius (optimum temperature for DNA polymerase)
Adds free nucleotides until reaches other end
=New double stranded DNA molecule formed
Repeated many times so amount of DNA increases exponentially
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