The analysis is based on several techniques, including electrophoresis and DNA hybridization. Varied parts of the DNA is made visible by a ribbon pattern. The method used for simultaneously examine numerous diverse parts of the genetic material.
A drop of blood the size of a pinhead is enough, because there are techniques in which DNA can multiply many times (polymerase chain reaction). DNA analysis technique was first performed by the British geneticist Alec Jeffreys in 1985.