Biology - Biotechnology - PCR and gel electrophoresis - PCR: The DNA Photocopier
5-step explanation of PCR. Step 1: 'PURPOSE - PCR (Polymerase Chain Reaction) amplifies a tiny DNA sample into millions of copies. Invented by Kary Mullis, 1983. Used in: forensics (crime scene DNA), disease diagnosis (COVID tests), genetic research.' Step 2: 'DENATURATION (95°C) - Heat separates th