Biology

What Is PCR? Imagine you find a single strand of hair at a crime scene. Inside that hair is a tiny, tiny amount of DNA that is barely enough to test. How do scientists work with something so small? The answer is PCR, Polymerase Chain Reaction. It's a technique that copies a specific segment of DNA millions (or even billions) of times, so there's enough to analyze. Think of PCR as a DNA photocopier PCR is fast, precise, and incredibly powerful. The Big Idea PCR takes a tiny p