Flatt/Flett/Vliet/Fleet DNA Project

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Project Members-you can compare your results with others in 2 ways. In your member screen/click on kit #/setup preferences/match against entire database ( If you match with another surname, it may only be meaningful if you happen to find the same surname via marriage or census reference in the neighborhood.) Also, to compare against all other DNA company projects, upload your results to Ysearch- in member screen, click on Kit number, YDNA matches, then, Click Here to Upload to YSearch.org- here's the direct Ysearch link or click tab above.

DYS 19 is also known as DYS 394.

It is obvious from our observation of 1000's of samples that some markers change or mutate at a faster rate than others. While that actual 'faster rate' has not yet been definitively calculated, not all markers should be treated the same for evaluation purposes.
The markers in red have shown a faster mutation rate then the average, and therefore these markers are very helpful at splitting lineages into sub sets, or branches, within your family tree.Explained another way, if you match exactly on all of the markers except for one or a few of the markers we have determined mutate more quickly, then despite the mutation this mismatch only slightly decreases the probability of two people in your surname group who match 11/12 or even 23/25 of not sharing a recent common ancestor.
Interpreting genetic distance- 12 markers   Interpreting genetic distance -25 markers   Interpreting genetic distance 37 markers

What are the probabilities of matching?    More information

Table Shows # of Generations





95% Confidence Interval
12-0 Match exactly at all 12 markers 




11-1 11 exact matches, 1 mismatch 




10-2 10 exact matches, 2 mismatch 




25-0 Match exactly at all 25 markers 




24-1 24 exact matches, 1 mismatch 




23-2 23 exact matches, 2 mismatch 







DNA - Deoxyribonucleic Acid:  the main constituent of chromosomes - the double helix containing the chemical code that defines who and what we are.
Allele Numbers:  Any of two or more genes that have the same relative position  on related chromosomes
Numbers are Repeats:  Each participant's allele repeats for their measured loci (DYS) in the following table.  Comparison of these results (numbers) is analogous to matching the scratches on bullets to determine which ones were fired from the same gun.

Why Some Rows Are Longer: - Most Recent Common Ancestor (MRCA)
Some participants took the 12 Marker test  - 14.4 generation MRCA
Some participants took the 25 Marker test   -  6.8 generations MRCA


The Y-chromosome signatures change very slowly over time and the pattern is usually stable over hundreds of years, but for some unknown and unexpected reason, a mutation can occur without notice in any generation.  Male relatives who have an uninterrupted male-male link between them will share the same, or very similar Y-chromosome signatures. The Y-line is particularly useful when a connection between different branches of a family is suspected but cannot be proven from written records.  Using the Y-line, by comparing the Y-chromosome signatures, provides the answer. A[ generation for genealogical purposes is usually considered to be 30 years, whereas a generation for DNA purposes is usually considered to be about 20-25 years.  Some of the reasons that can cause a Y-line to be a non-match with a participants' previous genealogical paper research and/or family tradition include incorrect paper genealogy research;  adoption;  rape; or infidelity.


We see two distinct lines so far. The Flatts of Methwold, UK and the Flatt lines which were from NJ. The descendant of Dirck Jansan Van Der Vliet is a distinct line, which does not match the other two; matches on 12 markers a descendant of Jacob B Vliet. Two descendants of  Van Vliet (Netherlands) and Fan Flit (Russia) are distinct lines; they also do not match the Vliets that have tested so far. Two Van Fleets also are a distinct line.  Looking for Vliets/Van Fleets and Flatts from the eastern seaboard (New York, New Jersey) to test further.

The Flatts from TN/KY/PA/NJ match. This doesn't necessarily mean there is one person of common origin but does show that all these lines share a common DNA origin. Still looking for Flatts from MA/NJ/DC area to compare with. At this point, it's not possible to tie all these families to one person of origin.

FLETT-Flatt- connection looks extremely likely to show that Flatts in TN/KY/PA/NJ have an Orkney Islands, Scotland connection- from Jim Wilson: "I finally have the results for my Flett lineage - I knew already that it was a good match for the R1a Flatts but you can see now at ysearch ID X6SS5 I have absolutely no doubt that the R1a Flatts are in reality Fletts from Orkney. Note that my lineage of Fletts (from Harray in Orkney) have two mutations relative to the other Fletts in my sample (looking at the original 10 markers) - at 389A and B. So there are other Fletts in Orkney that carry 13 30 at this marker as do the R1a Flatts.
What is interesting is that at 25 markers my lineage differs from the Flatts in your study at 7, 8 or 9 markers, which sounds like quite a lot, but some of these markers are very fast mutators. It means that it should be possible in the future to work out which branch of the Orkney Fletts the Flatt lineages spring from. I have a number of DNA samples from other Flett lines in Orkney (from different parts of Orkney) but I intend collecting more in the coming years. Flett is a perfect name for genetic genealogy as it is very old and so the links between the branches are pre-paper genealogy in many cases (even though we have excellent paper genealogy for Harray Fletts at least going back to the 15th century). I think we have also managed to break down the brick walls for these people as well! Hopefully they will have a closer match to some of the other lineages that I sample. - they will form part of an academic study that I am planning called ORKNEYINGAR - the people of Orkney. The collection phase of this is ongoing, but I have not yet raised funds for the genotyping phase.
Note also that the 19,23 at marker YCAIIa,b shows that the Fletts are in the widespread subtype of R1a, not the Norway-specific type. They are still definitely Norse, but there are two subtypes and the Fletts are in the more widespread one."

 One interesting item this project has been seeking to prove is whether an unsubstantiated claim that Flatts on the eastern seaboard are descendants of Dirck Janz Van Vliet; at least so far the DNA evidence discounts this claim. In fact, at this point, I strongly suggest that the DNA evidence shows, for the TN/NJ/KY/PA Flatts an origin of Scotland and not The Netherlands and that it becomes the responsibility of those who would want to prove otherwise to show paper documentation proof. For me, I have removed the link.

Participants in the project are encouraged to call FamilyTreeDNA directly for comprehensive discussion of the particular markers.

  IF YOU WISH TO CONTACT ONE OF THE TEST MEMBERS, AND THEY HAVE GIVEN PERMISSION TO HAVE AN EMAIL LINK, YOU MAY CLICK ON THE KIT NUMBER ON THE RESULTS, WHICH WILL TAKE YOU TO AN EMAIL FORM. If you see *TBD* in the results line, it indicates that the person, although participating, has not sent information indicating which Flatt/Flett/Van Vliet/Fleet he or she is testing on.  If we are unable to contact the participant for lineage information after repeated efforts, the test results will be removed until we hear.


NOTE: Please contact the project manager if you wish to link to this page. Please do NOT copy and paste the chart to other pages. Thank You-