What is DNA fingerprinting? | Explained

Just like the government uses an Aadhaar number to uniquely identify an individual for social security purposes, a person’s DNA fingerprint can be used for biological purposes. When a cell divides and needs to make a copy of its DNA, it pulls the strands apart and makes a new complementary strand for each one: As on one strand get Ts on the other and Cs get Gs. They use a laboratory procedure called Polymerase Chain Reaction to make copies of a particular stretch of DNA. If a polymerase called Taq polymerase is used, the temperature is held at around 72º C. In these three steps, called one cycle, a new copy of the DNA segment is ready.