What is the reason for Sohu paternity test?

Paternity identification is based on the theory and practice of human genetics, analyzing the genetic characteristics from the morphological structure or physiological function of offspring and parents, judging the suspicious biological relationship between father and son or mother and child, and making positive or negative conclusions. The methods of paternity test in forensic medicine include blood group identification, appearance comparison, skin texture examination, genetic disease examination, earwax difference, taste blindness examination, pregnancy, childbirth and reproductive ability inference.

The basic principle of paternity testing is that the human genome is a system with a very stable structure, and at the same time it is a system with variation. In the process of long-term evolution, the sequence of genomic DNA is constantly changing. Some of these mutations are preserved, which leads to differences and polymorphisms in genomes among different races, groups and individuals. No two individuals have the same genome except identical twins. At present, this technology can be widely used in medicine, forensic medicine and other fields. The original DNA fingerprinting technology is multi-site DNA fingerprinting technology, also known as restriction fragment length polymorphism technology. With the deepening understanding of the human genome, a second DNA fingerprinting technique for detecting a single gene locus has emerged. At present, the second generation DNA fingerprinting technology is mainly used to detect STR alleles in paternity testing, which can identify blood, hair, nails, exfoliated epithelial cells, spermatorrhea, blood stains, amniotic fluid, villi and so on. All these can get a person's exact genotype, so the amniotic fluid of pregnant women can be used to identify the unborn fetus. Using this technology for paternity testing, the positive probability can reach more than 99.99%, and the accuracy of denying the biological father is higher.