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Why doesn't "known" plus "non-matching known" snps add up?

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  • Why doesn't "known" plus "non-matching known" snps add up?

    There's probably a very simple answer for this but...

    My BigY Known SNPs number in excess of 36000, and my matches share about 25000-27000 of them, with 0-4 Non-Matching, Known SNPs. That doesn't add up to 36000+, nor do any two matches add up to the same value.

    How does this work?

    Thanks,
    Steve

  • #2
    FTDNA calls SNP results as +, - or ?
    I think the answer is this: If you and another tester both have a + or both have a - for a specific SNP then that is a matching SNP. Likewise if one of you has a + and the other has a - then it is a non-matching SNP. But if either of you has a ? then it is neither a match nor a non-match.

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    • #3
      Originally posted by GarethH View Post
      FTDNA calls SNP results as +, - or ?
      I think the answer is this: If you and another tester both have a + or both have a - for a specific SNP then that is a matching SNP. Likewise if one of you has a + and the other has a - then it is a non-matching SNP. But if either of you has a ? then it is neither a match nor a non-match.
      OK, a good 8800 or so of my SNPs are Derived = ? or blank (my Novel Variants). So for my match who only has ~25200 matching Known SNPs, they have almost 2000 "?" where I have Yes or No?

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