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  • X-DNA bug

    I have 3 first cousins, they are all full brothers. They have all strong match on the X-DNA, but no full matches (195.95 cM). But all of them get full matches on the X-DNA with a woman who is totally unknown to all of us. This looks totally absurd to me, it looks as a serious bug. From what we know about the X-DNA, this seems as an impossible result. Has anyone experienced bugs of this kind??

  • #2
    There have been several similar reports here recently. I believe at least a few of them were reported to FTDNA customer service and found to be false matches, due to some sort of technical issue (the nature of which I don't think has been explained). If the unknown match does NOT share significant autosomal DNA, yes, it is extremely unlikely that the full X match is real.

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    • #3
      You could construct a synthetic kit for a female which would have an X-match with every male kit. GEDmatch probably needs better filters on what it allows.

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      • #4
        I just came across a similar situation with an x-match with an unknown female person with whom my match statistics are the same as I have with my mother. Neither my mother nor my sister show an atDNA match with this other person.

        My match with my mother:
        • Genomic Position: 1370495 - 154570039
        • Shared cM: 195.93
        • SNPs: 18092
        My match with the female person to whom neither my mother nor I have at atDNA match:
        • Genomic Position: 1370495 - 154570039
        • Shared cM: 195.93
        • SNPs: 18092
        And just for a cross-reference, my x-Match with my sister:
        • Genomic Position: 33039414 - 67881743
        • Shared cM: 31.20
        • SNPs: 3000
        and
        • Genomic Position: 115483021 - 137934767
        • Shared cM: 26.61
        • SNPs: 2850


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