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  • Match on Family Finder full X

    I am male, my mum has just got a match and the X is the same as I have with my mum! 1370495 to 154570039, 195.93cM, 18092 SNPs

    There are no other major cM except a 8.48.

    Is this even possible or is it a glitch?






  • #2
    FTDNA don't take the X into account so place the match at 5th cousin. Here are the full chromosome amounts:

    1 44,805,958 47,629,198 1.44 600

    1 86,394,873 88,628,669 3.24 597

    3 163,183,135 168,639,652 2.74 800

    10 104,404,211 106,318,781 1.86 500

    11 13,382,409 16,194,663 2.88 700

    11 84,433,193 94,009,613 8.48 2,300

    12 6,939,881 9,852,782 4.03 700

    12 109,884,154 112,759,696 3.06 600

    16 64,798,732 67,158,356 2.65 500

    17 36,593,956 39,301,706 2.49 600

    18 39,563,514 41,490,428 2.39 500

    X 1,370,495 154,570,039 195.93 18,092

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    • #3
      As a male you only have one X chromosome, which you got entirely from your mother. So for you to match your mother 100% is normal.

      but for you to have a full X match with a distant match is very unusual. I know of one person who has watched an X match travel unbroken for four generations. Yours is probably greater.

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      • #4




        Thanks

        So do you think it is genuine and if so what range of cousin could this be?

        Originally posted by mabrams View Post
        As a male you only have one X chromosome, which you got entirely from your mother. So for you to match your mother 100% is normal.

        but for you to have a full X match with a distant match is very unusual. I know of one person who has watched an X match travel unbroken for four generations. Yours is probably greater.

        Comment


        • #5
          I would inquire with FTDNA to confirm, asking them to check this kits (match) Raw DAta to confirm it is a valid file (ie faulty transfer kit)

          Comment


          • #6
            Its very tough to predict the correct range of cousin, particularly after third or more, using the autosomes. The X is even worse, to the point that estimating relationships from the X is just unreliable. So the 8.3 suggests a fairly distant cousin, 4th to 5th according to the math. Slight chance of third. and 6th or 7th are also possible.

            I dont know what to make of the full X. I hope someone else chimes in. It does suggest closer rather than farther, but still hard to say.

            Does this person also match you on the X? Just pointing out you can match mum on one of her X chromosomes, and this person matches your mum on the other X, and so the person does not match you...

            It would be good if all three of you were also loaded at GedMatch so you can double check the X matching. Just to remove the glitch hypothesis you mentioned originally. I dont think it will make a difference, but I also believe in double checking everything when possible. There is also an X matrix tool at GedMatch.

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            • #7
              Thanks

              They don't match me on chr 1-22 so they don't show. So unfortunately I cannot compare with them alone.

              As you say I will suggest Gedmatch to them, however we are communicating via Google Translate as they are Spanish so Joining Gedmatch may be tricky


              Originally posted by mabrams View Post

              Does this person also match you on the X? Just pointing out you can match mum on one of her X chromosomes, and this person matches your mum on the other X, and so the person does not match you...

              Comment


              • #8
                I am awaiting their response on it

                Originally posted by prairielad View Post
                I would inquire with FTDNA to confirm, asking them to check this kits (match) Raw DAta to confirm it is a valid file (ie faulty transfer kit)

                Comment


                • #9
                  FTDNA reply:

                  "The issue appears to be with the matches' kit. The account has already been reported to our IT team and they are currently working to resolve the issue. Unfortunately we do not have a time frame for when this will be resolved, but I will add your information to their investigation. Thank you for your patience while we work to resolve this problem."



                  Apparently the transfer is from 23andMe and my mum is no match with them at any level.

                  So a major glitch needs to be rectified!

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