(Combined DNA Index System) Microsatellite loci

    The standard human DNA forensic testing set used by the FBI and RCMP comprises 13 loci, each of which is located on a separate chromosome. The observed range of variation at these loci is sufficient that the probability of any two individuals showing the same pattern at all 13 loci is <1 / 1015, more than five orders-of-magnitude less than current human population of 6 x 109. Note that the CODIS set does not include markers for the X- and Y-chromosomes, which are typed separately.

Figure © 2012 TA Brown, Introduction to Genetics (1st ed.); additional text © 2012 by Steven M. Carr