What does dna typing mean

DNA typing, a DNA analysis technique for identifying individual organisms by comparative molecular genotyping.

DNA typing is a technique used to compare DNA from biological samples by restriction endonuclease digestion, electrophoretic separation, and isotope-labeled duplicate DNA hybridization, which provides a radioautographic banding pattern specific to each individual.

In the mid-1980s, DNA typing technology began to be used in forensic identification, a drop of blood, a touch of saliva, a hair, as long as the human body cells, can be used for DNA analysis, identification. 1985 for the first time the application of DNA typing technology, a British immigration disputes successfully paternity testing, and in 1986 for the first time used in a rape and murder In 1986, it was used for the first time in a criminal case of rape and murder, to find and identify suspects from thousands of people, and DNA typing technology has made a qualitative leap.

Forensic application of DNA typing

Criminal investigation. DNA typing technology is a new means of investigation, in the old technology era of investigation, incomplete or unclear fingerprints can not distinguish the fingerprints of the owner's exact identity and lose their roles, and through DNA typing technology can be analyzed by fingerprints left by the oil, sweat, dander and other things to DNA. The DNA typing technology can help analyze the case by analyzing the DNA of the oil, sweat, dander, etc. left by the fingerprints to determine the exact identity of the owner of the fingerprints.

Paternity testing. DNA fingerprinting has been used to determine paternity for more than 20 years, since the first positive identification of a mother and child in an immigration dispute by Jeffries et al. in 1985. Representative reports include: in the identification of an unidentified body, experts will extract the DNA from the blood of the decomposed body, and the DNA of both parents of the presumed victim for DNA fingerprinting, and successfully identified the person of the unidentified body.