Chance of a random match for your profile (that is, it seems identical to another person).

The odds that another human being would have your exact DNA Fingerprint or genetic profile, or that the match is a mere coincidence. Expressed as, for instance, 1E+21, in other words 1 followed by 21 zeros, that is, a 1 in 1,000,000,000,000,000,000,000 (sextillion) chance that such a coincidence would occur. The higher the number the stronger the match in our .

Determination of the order of nucleotides (base sequences) in a DNA molecule.

Chromosomes that are different in the two sexes and involved in sex determination. Males receive XY, females XX.

pronounced "snip": single nucleotide polymorphism

Short Tandem Repeat DNA Internet Database, created by John M. Butler and Dennis J. Reeder at the National Institute for Standards and Technology Biotechnology Division

Different DNA studies look at different ranges of nucleotide positions, many reporting only HVR1 mutations. The position 16519 is rarely included in published studies. Richards et al. 2000 generally includes only 16090-16365.

DNA Testing Systems uses a proprietary 13-marker test developed with Sorenson Genomics, a leader in high throughput genealogical testing. This standard allows us to find matches for you in a number of world gene banks and public databases. The same 13 sites on the Y chromosome are used in forensic and genealogical casework. They are searchable, for instance, in the YHRD, as well as admissible as evidence in a court of law. The 13 World-Match™ scores create your haplotype. Results are comparable with all other testing companies, including Family Tree DNA, Identigen (GeneTree), Relative Genetics (Ancestry.com), and Oxford Ancestors.