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Introduction to FTDNA X-Chromosome Segment Matching

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  • #16
    Chr Start Location End Location Centimorgans (cM) SNPs
    X 2446434 4716986 11.6 331
    X 6235609 7564670 1.7 134
    X 7567246 8641567 1.7 150
    X 12108874 12647010 1.2 135
    X 14875784 17154243 2.0 276
    X 22024626 22582104 1.9 183
    X 22679353 23525712 4.2 208
    X 27759859 29163088 1.7 144
    X 30233837 31151660 1.3 148
    X 31333759 32441362 4.2 313
    X 36549638 37734602 1.7 103
    X 40626824 42587743 3.0 211
    X 45556938 47834835 4.3 303
    X 48024347 49766995 1.3 183
    X 50268888 53451302 2.3 200
    X 53888348 58252541 1.5 244
    X 95814806 96995537 1.5 139
    X 97107627 99490509 2.8 192
    X 104000146 107961898 1.1 309
    X 108904776 112003465 4.2 289
    X 116506884 118043316 1.6 203
    X 121209482 123240022 3.5 329
    X 124225707 125510522 2.0 114
    X 126698668 130055579 2.6 378
    X 131808162 133915839 2.3 185
    X 133954060 135582767 1.8 187
    X 142619865 143510430 2.4 112
    X 144087744 144814801 1.5 137
    X 145393541 146482974 2.2 161
    X 146487436 148406917 3.7 251
    X 149157975 150072647 3.2 177
    X 150861673 151928073 3.9 156
    X 152269895 154886292 2.9 399
    Largest segment = 11.6 cM
    Total of segments > 1 cM = 88.8 cM Actual.

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    • #17
      Hazel, those segment sizes and/or SNP counts are very low. I would not expect to find a match within a genealogical time period.

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      • #18
        Originally posted by Kathy Johnston View Post
        Hazel, those segment sizes and/or SNP counts are very low. I would not expect to find a match within a genealogical time period.

        thank you, I have not been able to find a match on anything so far but am new to all this.

        So this means we do have a common ancestry but it would be way, way back in time.

        I was thinking it could be "noise"

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        • #19
          Originally posted by hazel_ion View Post
          thank you, I have not been able to find a match on anything so far but am new to all this.

          So this means we do have a common ancestry but it would be way, way back in time.

          I was thinking it could be "noise"
          It could be noise.

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          • #20
            One thing nobody ever seems to mention is the fact that part of the X chromosome recombines with the Y Chromosome.

            So it is in fact possible for you to inherit part of your X chromosome from your mother's father's father. Your mother's father's X partially recombined with his Y, so one of your mother's X's contains a portion of her father's Y, and then her two X's recombine and you likely get some of that passed onto you.

            The same holds true for your father. Part of his X and Y recombined, so if you are male, you received part of the X he got from his mother in your Y chromosome, and of course the rest of the Y from him, but even his Y was a combination of his father's X and Y. If you are female, you still receive part of the Y that your father got from his father.

            Moral of the story is, as long as the X match doesn't filter out the part of the X that recombines with the Y, it is not a very accurate indicator of anything.

            Oh, and here's a video that shows how the X/Y recombination is different than the other chromosomes! https://www.biointeractive.org/class...n-y-chromosome

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            • #21
              snetphilie, did you really have to post this in so many threads? It borders on spamming. You could have started one thread to discuss this topic.

              Plus, X chromosome recombination with Y chromosome is a topic that has been discussed in this thread: "Could an X-match be a Y-match?" in January 2018 (in which you posted the same comment above, as with so many other threads; did you even read that thread?). The bottom line seems to be that the two segments that might be recombined are very small, small enough not to even consider except in rare cases.

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              • #22
                snetphilie, so you say you can "inherit part of the X from your mother's father's father? Hmmm......

                Are you aware that the X has its own distinct pattern of inheritance? And it cannot pass through two successive men.

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