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Please help with 464s & genetic distances

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  • Please help with 464s & genetic distances

    14 25 15 11 11 14 12 12 10 13 11 30 15 9 10 11 11 23 14 20 33 12 15 15 16
    13 25 15 11 11 14 12 12 10 13 11 30 15 9 10 11 11 23 14 20 32 12 12 14 15 16 16

    Please confirm the GD between these two sets of results at 25 and 25+2 markers respectively.

    And can anything be surmised about the difference of 13 & 14 at 393?

    Much obliged.

  • #2
    GD is simply the sum of the differences for each marker, which is 7 across the 25 and 39 across the 27.

    As for the values of 13 and 14 for STR 393, the table of frequencies of Y-STR alleles (linked below) shows that for haplogroup "I" 68% of those tested have a count of 13 and 17% have a count of 14, whereas with R1a, 95% have 13 and 5% have 14.

    I think the author of this table was the late Leo Little, and so it may not have been updated for some time:

    http://freepages.genealogy.rootsweb....logy/yfreq.htm

    Hope that helps!

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    • #3
      It Is Not That Easy

      As stated above, GD is simply the sum of the differences for each marker, more or less. There are special rules that are applied to multi copy markers. I think you have a very special case where one person has 4 copies of 464 and the other has 6 copies.

      Remember also that FTDNA reports 464 from low to high, not in the order of occurrence.

      I suggest you contact FTDNA with your question.

      Comment


      • #4
        Originally posted by Jim Barrett View Post
        I think you have a very special case where one person has 4 copies of 464 and the other has 6 copies.
        I have noted several other occurrences of that here and there, and had formed the impression that FTDNA may now be testing for 464a/b/c/d/e/f, that is, 27 instead of 25 markers.

        I suggest you contact FTDNA with your question.
        Ditto.

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        • #5
          Originally posted by gtc View Post
          I have noted several other occurrences of that here and there, and had formed the impression that FTDNA may now be testing for 464a/b/c/d/e/f, that is, 27 instead of 25 markers.



          Ditto.
          FTDNA will always report a value if there is one for 464 e, f and/or g.
          They will also report the value if anyone has a result for 19b.
          They do not do this as an extra test, its just that very few families have these values.
          This is why some project result pages at FTDNA have a few extra columns.

          (Im pretty sure the James Project has had a 19b man since at least 2006.)

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          • #6
            The following webpage may help a bit.

            http://freepages.genealogy.rootsweb....pp/DNA/464.htm

            Comment


            • #7
              Originally posted by Jim Barrett View Post
              There are special rules that are applied to multi copy markers.
              More info here, but it gets quite complicated:

              http://www.roperld.com/YMarkers.htm#DYS464

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