Triangulation Groups

Triangulation Groups (TGs) consist of people who all have the same piece or segment of DNA. Everyone in a TG inherited the DNA segment from a common ancestor or ancestral couple. Information about three things taken together identify a TG:

  1. The DNA segment. (Chromosome # and start and end base pair positions.)
  2. The people in the TG. (They must all match each other on the DNA segment specified in #1.)
  3. The common ancestor or ancestral couple of everyone in the TG.

The TGs identified by the Mauk DNA Project are listed on separate password protected web pages.

    Triangulation Group (TG) Page Format

    [1] Triangulation Group ID

    [2] (Chr. #) Start Mbp – End Mbp (Size in cM)[3] Most Recent Common Ancestors (MRCAs)
    [4] Descendant[5] Kit #[6] Child[7] Grandchild[8] Generation[9] Side
    Name**######NameName# g-grandchildMaternal
    Name**######NameName# g-grandchildor
    Name**######NameName# g-grandchildPaternal


    1. A unique ID for the Triangulation Group (TG), see note below.
    2. Information about the TG’s overlapping segment.
    3. Most Recent Common Ancestors (MRCAs) from whom everyone in the TG inherited the segment.
    4. Name of a person who has this segment.
    5. GEDmatch kit # of the person in this row.
    6. Child of the MRCAs who was the ancestor of the person in this row.
    7. Grandchild of the MRCAs who was the ancestor of the person in this row.
    8. Relationship of the person in this row to the MRCAs.
    9. Whether this segment was on the maternal or paternal chromosome of the person on this row.

    Note: Triangulation Group ID format: Two digits for Chromosome # (01-22); one letter for start position (A = 0-10 Mbp, B=10-20 MBP, etc.); one digit (if needed) to distinguish TGs from the same ancestral couple (1-4); colon; WikiTree ID for ancestral couple male; slash; WikiTree ID for ancestral couple female.

    Website Built with