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Big-Y results considering STR tests

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  • Big-Y results considering STR tests

    Curious if anyone else has been able to compare Big-Y matches to higher Y-XXX testing. In my case, I have a gentleman who matches me at 78 (of 90) variants, no known SNP differences, and 26650 SNP matches. He has also taken Y111 and matches me there with a GD of 10.

    Now, I'm GD1 to my father, so it can be considered GD9. Still, that's somewhat disappointingly distant given the closeness of the Big-Y match, with roughly a 50% chance of a common ancestor in the last ~14 generations. This is significantly less likely than an FMS match, which has 50% chance at 5 generations.

    Other data points?

  • #2
    GD STR vs SNP

    In my surname group two of us are I-Z382+, GD 8(STR111) and GD 2(known SNP) (CTS5609 and PF3643)


    • #3
      Another data point just came in:

      63 (of 90) shared novel variants
      0 known SNP differences
      26697 matching SNPs

      He's taken Y37 and shared the results directly with me, resulting in GD13/Y37. That means the common male ancestor is likely at least 2000 years ago.

      Implication is a novel variant every ~3 generations.


      • #4
        In the Swedish DNA group some people with the same haplo-group checked out their results. I believe they were five people, four had taken the Big-Y and one the FullGenome test. They analyzed the results returned from YFull.

        SNP tests like these can't give 100% sure info on STR's, like the STR tests only really can predict SNP's. Anyway, YFull predicted around 100 of the 111 from the Y-DNA 111 test.

        From what they could see, the four Big-Y tests together had five differences ("errors") compared to the Y-DNA 111 tests. The FullGenome test itself had about the same amount of differences (I don't remember the exact result).


        • #5
          Thomas Krahn of YSeq mentioned at the iFGG that YFull is able to find those STRs without too much trouble except for the lengthier STRs.

          If I didn't do y-111 already, I would have used the STR data from YFull for the shorter STRs and ordered the longer STRs a la carte using Sanger sequencing.