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  • STR markers

    If someone can help I have questions about STR markers and how to properly compare against people and geographical markers.
    1.)I have completed the testing through STR markers 111 (male).
    If my STR markers 1 through 111 are compared with another person and there is only 4 differences then we are related at some point in our line. At what point (number) are we not considered related? Same question for markers 67 and 37. When is the difference in the amount of markers not matching not make me related to a person at any point?

    2.)I have joined the Y-DNA group for Great Britain hoping to narrow down where my line might have lived if this is possible.
    My DNA marker has me in the unknown group so I am going to try and figure this out my self.
    So what I need to know is for a geographical area how may of my STR markers need not match to say that my line is not from particular region?

    3.) In looking at the MIN ,MAX and MOD numbers associated with a county in England I am guessing that if my STR number falls within the numbers I have a match. Example
    For DYS389ii for Cornwall the min= 26 max=33 mod=29 so if my STR number is 30 I match this group. Is this correct or am I mistaken?

    If anyone can please help me in my confusion?
    Steven Andrews

  • #2
    https://www.familytreedna.com/learn/y-dna-testing/

    If two men share a surname, how should the genetic distance at 111 Y-Chromosome STR markers be interpreted?
    https://www.familytreedna.com/learn/...s-interpreted/

    If two men share a surname, how should the genetic distance at 67 Y-Chromosome STR markers be interpreted?
    https://www.familytreedna.com/learn/...s-interpreted/

    If two men share a surname, how should the genetic distance at 37 Y-Chromosome STR markers be interpreted?
    https://www.familytreedna.com/learn/...s-interpreted/

    If two men share a surname, how should the genetic distance at 25 Y-Chromosome STR markers be interpreted?
    https://www.familytreedna.com/learn/...s-interpreted/

    If two men share a surname, how should the genetic distance at 12 Y-Chromosome STR markers be interpreted?
    https://www.familytreedna.com/learn/...s-interpreted/

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    • #3
      You should be able to go to your match list and from the drop down menu change it to show only matches from that particular project. If you're matching with any project members they'll show up, and this may help you narrow down how you fit when you look to see where they are grouped in the project.

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      • #4
        STR markers

        Thanks you that information is what I needed for the person to person match. Now I just need a explanation on how to match the counties with my STR .

        Comment


        • #5
          Originally posted by David Guetta View Post
          You should be able to go to your match list and from the drop down menu change it to show only matches from that particular project. If you're matching with any project members they'll show up, and this may help you narrow down how you fit when you look to see where they are grouped in the project.
          David, thank you for pointing out that feature. I had not noticed it before. Unlike most project displays, you can see who owns the kit with this.

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          • #6
            Steven, if you can afford it, consider either Big Y or some other form of testing SNPs.

            W. (Mr.)

            Comment


            • #7
              If you are confident of your surname being your true lineage then conventional genealogy can help. Many English surnames were far more localised than we may think today. Look at Family Search and enter just the surname and either No County or go through the counties one by one, and just search pre 1600. If you are fortunate you may see concentrations in particular counties and even parishes. At worst it may well eliminate a good many counties as unlikely.

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