The polymorphisms displayed at each locus on the DNA are by themselves very common. Typically, each allele (variation) will be shared by around 5-20% of individuals. When looking at multiple markers, it is the unique combinations of these polymorphisms to an individual that makes DNA Fingerprinting such a good identification tool. The more markers that are tested the more discriminating the test becomes, and the higher the relief in population matches. The standard number is 16.