Answer
Kary Mullis was an American biochemist who is credited with inventing the polymerase chain reaction (PCR) in 1983. PCR is a technique used to amplify DNA, which is the genetic material of living things. Mullis's work on PCR has had a profound impact on the field of molecular biology, and it is now used in a wide variety of applications, including DNA fingerprinting, genetic testing, and forensic science.