The correct order of steps in Polymerase Chain Reaction (PCR) is
extension, denaturation, annealing
annealing, extension, denaturation
denaturation, extension, annealing
denaturation, annealing, extension
Each cycle of PCR (Polymerase chain reaction) has three steps:
(i) Denaturation
(ii) Primer annealing
(iii) Extension of primers