Genetic distance is the term used to describe the number of differences or mutations between two sets of Y-chromosome DNA or mitochondrial DNA test results. A genetic distance of zero means that there are no differences in the two results and there is an exact match.
See also the following Family Tree DNA FAQs in the FTDNA Learning Center:
- Definition of genetic distance?
- How is genetic distance calculated for null values?
- Y-DNA genetic distance
- In Gap 2.0 what is the Y-DNA genetic distance page?
- How does the infinite allele comparison method work for palindromic markers?
Note that as of 12 December 2012 Family Tree DNA changed the way that they calculated genetic distance for palindromic STR markers and null allele values. This had the effect of changing the degree of matching for some people.
Genebase Learning Center
- How is genetic distance calculated for Y-DNA STR markers Genebase tutorial. Accessed 9 November 2013.
- Is Genetic Distance an Adequate Predictor of Relationships? by Jim Owston, The Lineal Arboretum, 19 June 2014.
- Definition of genetic distance Family Tree DNA Learning Center