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  • Gedmatch Genesis

    A match with a Mr Smith has appeared at Gedmatch Genesis. Mr Smith tested at Living DNA and my tester tested at FtDNA.

    Below are chromosome numbers, start & end postns and SNPs

    1 239,306,468 242,070,731 7.9cM 209SNPs
    4 174,642,677 180,903,852 9.0cM 377SNPs
    6 5,954,189 9,422,071 7.7cM 255SNPs
    18 5,986,416 8,730,053 12.4cM 218SNPs


    Total Half-Match segments (HIR) = 37.0 cM (1.0 Pct)
    Estimated number of generations to MRCA = 4.3

    148608 SNPs used for this comparison.

    54.5 Pct SNPs are full identical

    Although they share a few cMs, I was wondering whether the shared SNPs is low. Opinions welcomed.

    Mr Smith hasn't replied to the e-mail so I have no idea who he is.

  • #2
    Originally posted by ltd-jean-pull View Post

    ......

    148608 SNPs used for this comparison.
    .....

    Although they share a few cMs, I was wondering whether the shared SNPs is low. Opinions welcomed.

    Mr Smith hasn't replied to the e-mail so I have no idea who he is.
    It is due to the low number of SNPs used in comparison.
    cM length is static for those sections of each chromosomes, but number of comparable SNPs depends on how many can be compared between each file along each of those segments.

    Many of these segments could be false due to this (low number of SNPs in each segment)

    To give each segment perspective, If it was a FTDNA to FTDNA comparison each of the segments would show roughly the following SNP count (Based on tested SNPs in FTDNA's Build 37 Raw Data)

    1 239,306,468 242,070,731 7.9cM 1017 SNPs
    4 174,642,677 180,903,852 9.0cM 1589 SNPs
    6 5,954,189 9,422,071 7.7cM 1443 SNPs
    18 5,986,416 8,730,053 12.4cM 1019 SNPs
    Last edited by prairielad; 29 October 2017, 01:41 AM.

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    • #3
      Thanks Prairielad.

      My tester's spouse's FtDNA kit has subsequently been uploaded and she matches Mr Smith as well! Three segments between 7 and 10.5 cM.

      Total Half-Match segments (HIR) = 25.2 cM (0.7 Pct)
      Estimated number of generations to MRCA = 4.6

      149012 SNPs used for this comparison.

      54.5 Pct SNPs are full identical.

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