Does DNA fingerprinting technology have application value in investigation and solving cases?

Starting from 1987, China police applied DNA detection technology to investigate and solve crimes for the first time.

Because DNA fingerprinting provides abundant individual-specific genetic markers, it is of great significance in forensic identification.

In the application of criminal cases in forensic medicine, if it is determined that a person is a criminal suspect, the DNA of his blood sample or hair can be extracted to make DNA fingerprints, and then compared with the DNA fingerprints of blood, semen, saliva, sputum, hair, bones or other physical components left over from the crime scene.

If they are the same, the fingerprints match, which proves that the suspect is the criminal who committed the crime, and vice versa. Usually, the signature of the above fingerprint matching is called "matching".

Extended data

Application of paternity test Since jeffries and others first identified the mother-child relationship in an immigration dispute in 1985, DNA fingerprinting technology has been used for paternity test for nearly 10 years.

Representative reports are as follows: In the process of identifying an unknown corpse, experts successfully identified the nameless corpse by comparing the DNA extracted from the residual blood of the rotting corpse with the DNA of the presumed victim's parents. In the case that routine serological tests can't make a positive conclusion on parent-child relationship, DNA fingerprinting can easily make a conclusion.

The identification of the wreckage of air crash victims usually relies only on forensic medicine and routine serological tests, so it is difficult to distinguish all the wreckage of air crash victims. Therefore, when conventional means are not feasible, DNA fingerprinting technology is the best choice.

Racial and gender identity? The research of the Central Research Bureau of the British Home Office shows that DNA fingerprinting technology can be used for racial identification to a great extent. It can detect polymorphic DNA fragments of whites and African blacks and their frequencies in a specific range, which is representative of species. Someone identified the sex of DNA degradation in the blood of 20 years old, and successfully distinguished people from animals.

Other applications to identify whether twins are fraternal twins or identical twins only need to compare their DNA fingerprints.

Baidu encyclopedia -dna detection technology