Final answer:
PCR is a technique used in biology to amplify specific regions of DNA for further analysis. It allows scientists to make millions of copies of a desired DNA sequence quickly.
Step-by-step explanation:
PCR, or polymerase chain reaction, is a technique used to amplify specific regions of DNA for further analysis. It allows scientists to make millions of copies of a desired target DNA sequence in just a few hours. PCR is used in various applications, such as cloning gene fragments, identifying genetic diseases, and sequencing DNA.