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| This is one of a series of articles on Genealogical Methods, prepared in association with The Tapestry. See Index for a list of related articles. |
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Source
- FTDNA FAQ:919 Link dead as of 18 April 2014; FAQ's may have been taken down.
Related
- Acceptance Critieria as a function of 15 Generation mutation events
FTDNA
The following table is based on FTDNA's FAQ:919.
| Characterization | Y-DNA12 | Y-DNA25 | Y-DNA37 | Y-DNA67 | Y-DNA111 | FTDNA's Suggested Interpretation | Notes/Issues
| | Very Tightly Related | N/A | N/A | 0 | 0 | 0 | Your exact match means your relatedness is extremely close. Few people achieve this close level of a match. All confidence levels are well within the time frame that surnames were adopted in Western Europe. | How should this be intrpreted? What does "All Confidence Levels" mean? Why is it specific to "Western Europe"? Presumably this means that if two kits match this closely they have a common ancestor who lived after the time surname were adopted. But some European nations adopted surnames by 1400, and others not until after 1800.
| | Tightly Related | N/A | N/A | 1 | 1-2 | 1-2 | Few people achieve this close level of a match. All confidence levels are well within the time frame that surnames were adopted in Western Europe.
| | Related | 0 | 0-1 | 2-3 | 3-4 | 3-5 | Your degree of matching is within the range of most well-established surname lineages in Western Europe. If you have tested with the Y-DNA12 or Y-DNA25 test, you should consider upgrading to additional STR markers. Doing so will improve your time to common ancestor calculations. | Presumably this means that there is a good probability that the kit owners share a common ancestor within a meaningful genealogical timeframe. Ie, their common ancestor lived in a time frame where it documentation to show their mutual line of descent may have survived.
| | Probably Related | 1 | 2 | 4 | 5-6 | 6-7 | Without additional evidence, it is unlikely that you share a common ancestor in recent genealogical times (1 to 6 generations). You may have a connection in more distant genealogical times (less than 15 generations). If you have traditional genealogy records that indicate a relationship, then by testing additional individuals you will either prove or disprove the connection. | The criteria label "Probably Related" seems to contradict the explanation: "It is unlikely...." for generations 1-6, and "You may" for less than 15 generations. At best saying "you may be related" is quite a bit different from saying "You are probably related", and certainly not consistent with saying "It is unlikely you are related".
| | Only Possibly Related | 2 | 3 | 5 | 7 | 8-10 | It is unlikely that you share a common ancestor in genealogical times (1 to 15 generations). Should you have traditional genealogy records that indicate a relationship, then by testing additional individuals you will either prove or disprove the connection. A careful review of your genealogical records is also recommended.
| | Not Related | 3 | 4 | 6 | >7 | >10 | You are not related on your Y-chromosome lineage within recent or distant genealogical times (1 to 15 generations). | A very emphatic statement, and certainly the least caveated of the critieria. Perhaps this should read "Highly unlikely".
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