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Matches and Segments

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  • Matches and Segments

    What is the better of the 2 examples

    1 - 27% matching in 1 segment


    2 - 27% matching in 5 segments

    IMO, they are equal, but some say differently.

    Any information will help.

    cheers

  • #2
    Neither is possible, so they are equally impossible.

    Comment


    • #3
      Sorry, but I will have to confess I donĀ“t understand the question. What are you trying to work out?

      Comment


      • #4
        Originally posted by hansonrf View Post
        Neither is possible, so they are equally impossible.
        Good point. If two people share 27% of DNA, they are half-siblings, grandparent/grandchild or uncle-aunt/nephew-niece. In any of those cases, they would share many more segments than 1 or 5.

        It would be better for the OP to use an actual example.

        Comment


        • #5
          Originally posted by MMaddi View Post
          Good point. If two people share 27% of DNA, they are half-siblings, grandparent/grandchild or uncle-aunt/nephew-niece. In any of those cases, they would share many more segments than 1 or 5.

          It would be better for the OP to use an actual example.
          for clarity

          my friend has one person who shares 27% of in 1 segment in 1 chromosome and he has another person which shares appox. 27% in total in 5 segments in 5 different chromosomes

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          • #6
            Insufficient data, still. Is this real or hypothetical?

            Different chromosomes have different lengths in terms of base-pairs. Centimorgans [cM] further vary significantly within a chromosome [in terms of numbers of base pairs per cM], based on the position relative to the ends and to the centromere. The point is, that's why we use cM's and not bp's or snp's as the unit of measure. How many cMs are in the segments and which chromosomes?

            If the 27% single segment is the X chromosome, it is a different game.

            Generally and hypothetically a smaller largest-segment often means the common ancestor is further back; more generations. [X excluded]

            Bob H.

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