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Does this make sense?

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  • Does this make sense?

    I've queried this with FTDNA but not heard back yet, but throw it out there for comment, as I am perplexed.

    It concerns three DNA tests.

    A took a 67 marker test.

    B took a 67 marker test.

    C took a 37 marker test.

    A and B can compare full marker results. C is not in communication.

    A and B have a Genetic Distance of 3 at 37 and 67 markers, all differences in 25-37 marker range.

    A and C have a genetic distance of 2 at 37 markers

    B and C have a GD 0 at 25 markers, but no GD at all at 37.

    If A and C only vary at 2 markers in the range 25-37 (and thus share 10 markers in that range) and A and B only vary at 3 markers matching in 9 markers in the range 25-37 how can B and C share none at 37?

    Hope that can be followed okay!

  • #2
    it doesn't mean B and C match none of the 26-37 markers it just means there are 5 or more mismatches at that level.

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    • #3
      Maybe this might help to visualize, since you said the men are exact at markers 1-25 this would just be an example of markers 26-37.

      A 11 11 19 23 16 17 20 17 36 38 12 12
      B 11 11 19 23 17 18 19 17 36 38 12 12
      C 12 11 19 24 16 17 20 17 36 38 12 12

      A and C = 2 mismatches = 35/37 match
      A and B = 3 mismatches = 34/37 match
      B and C = 5 mismatches = 32/37 no match

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      • #4
        Thanks Travers. I wasn't aware that 5 or more mismatches wouldn't show up. Makes sense really but I suppose I thought the threshold may have been higher than that.

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        • #5
          If those men were in the same project, you would be able to easily see the differences.

          W. (Mr.)

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