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  • x dna

    total largest gen adj total largest
    12.6 12.6 5.1 X 19.9 39.7 9.7


    Can anyone tell me how significant the X Dna is above please?

    Thanks

  • #2
    You and this match appear to be third cousins. The fact that you share X-DNA means the match is on your maternal side. Otherwise, one must be careful with X-DNA owning to its unusual inheritance path.

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    • #3
      Originally posted by MFWare View Post
      You and this match appear to be third cousins. The fact that you share X-DNA means the match is on your maternal side. Otherwise, one must be careful with X-DNA owning to its unusual inheritance path.
      A pair of 3rd cousins share 2 of their 16 great great grandparents.

      The X-DNA can however not be inherited through two generations of males, so for a male the shared X-DNA could only come from 5 of those 16 great great grandparents.

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      • #4
        Originally posted by Lklundin View Post
        A pair of 3rd cousins share 2 of their 16 great great grandparents.

        The X-DNA can however not be inherited through two generations of males, so for a male the shared X-DNA could only come from 5 of those 16 great great grandparents.
        That's correct. Here's the link to a very useful chart by genetic genealogist Blaine Bettinger - http://www.thegeneticgenealogist.com...8/12/1male.png - that shows you exactly which 5 of the 16 gg-grandparents can potentially contribute to the x in a male.

        Also, here's the link for the chart showing the ancestors who can contribute to the two x's in a female - http://www.thegeneticgenealogist.com...2008/12/1b.png In the case of a female 8 of the 16 gg-grandparents are potential contributors.

        This shows the usefulness of a match on the x in cousin-matching tests. In a male, you can eliminate 11 of 16 gg-grandparents as the line of the common ancestor and concentrate on the lines of the remaining 5 gg-grandparents. In a female, the x inheritance pattern eliminates the lines of 8 of the 16 gg-grandparents.

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        • #5
          Originally posted by MFWare View Post
          You and this match appear to be third cousins.
          How does one go about calculating level of relation from the xDNA match? Is there a chart somewhere? Is there the same problem with endogamous groups that we get from autosomal DNA?

          I've been wondering this for a while....

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