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67 marker yDNA results

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  • 67 marker yDNA results

    I just received the results of my 67 marker yDNA test. I have a 67/67 exact match to an unknown relative. From what I've read here that means we are extremely closely related. Can anyone tell me what that means exactly? What is extremely close?

  • #2
    STR mutations are, as far as we know, essentially random. There may be other factors that cause mutations, but until scientists establish what they are, all we have to go by are mutation rates, with a range of possibilities. So, while we know the average rate, an individual can have a higher or lower rate within a certain range.

    All that means is that your 67/67 match may be very recent - your father or a half-brother. Or he may be more distant, even as distant as a 3rd or 4th or even 5th cousin, if the mutation rate in your paternal line has been on the slow side. That's as much as your test results can tell you.

    It might be possible to get a better idea of how recently you're related if both of you upgrade to 111 markers. If you match at something like 109/111 or better, that would point toward a more recent common ancestor. If you have several mismatches at 111 markers, that would probably mean a slightly more distant common ancestor. But it still wouldn't tell you exactly what the relationship is with the match.

    At this point, only comparing what you know about your paternal line ancestry with what the match knows about his will narrow down the possibilities. For instance, even if you're an adoptee, you probably know when and where you were born. Compare that to the information your match has about his paternal line ancestors and their brothers. Was one of his paternal line ancestors or their brothers living in the same area where you were born about 9 months before you were born? That's the type of information that might establish who was the father of an adoptee.
    Last edited by MMaddi; 26 June 2015, 10:37 AM.

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    • #3
      MMaddi explained to you the science behind matching, in the post above.

      Use FTDNATiP for a simple take on probabilities for different relationship levels with your match.

      Look for the TiP icon https://www.familytreedna.com/img/my/icons/TiP_icon.gif next to your match name and click it.

      The following two items from the Family Tree DNA Learning Center would explain TiP and relationships

      https://www.familytreedna.com/learn/...-relationship/ How do I tell how closely I am related to a Y-Chromosome DNA (Y-DNA) match? What is FTDNATiP?

      https://www.familytreedna.com/learn/...ionship-match/ Expected Relationships with Y-DNA STR Matches

      W. (Mr.)

      P.S.
      Just to visualize how things change depending on numbers of markers and Genetic Distance, you may want to take a look at a table in Paternal Lineages http://www.familytreedna.com/learn/dna-basics/ydna/
      Last edited by dna; 26 June 2015, 10:50 AM.

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      • #4
        Originally posted by Txhsker View Post
        I just received the results of my 67 marker yDNA test. I have a 67/67 exact match to an unknown relative. From what I've read here that means we are extremely closely related. Can anyone tell me what that means exactly? What is extremely close?
        In your case he is not someone you know so you need to contact him to get some answers.

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        • #5
          I did forget to mention I am an adoptee. Sorry. I have a couple 2nd cousin matches at Ancestry with the same surname as my yDNA match. At the time I took the test I was looking to see if I could get a surname match and as it turns out I did..thank you for the replies.

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