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Questions pertaining to the DNA research method of determining common ancestors through the use of multiple tests to triangulate and locate a potential common ancestor, particularly with Autosomal DNA test results.

4
votes
1answer
90 views

Filtering for Triangulated matches in MyHeritage?

It's a real pain to try and find the triangulated matches that I share with another DNA donor. I might have to click on "show more DNA match" ten times before I see one triangulated match. Is there ...
5
votes
2answers
114 views

Determining shared maternal or paternal lineage via shared DNA segments?

If DNA cousins and I share the exact same segment of DNA, does it always mean we're related via the same side of the family? Background: I have taken DNA tests with National Geographic, Ancestry, ...
4
votes
1answer
330 views

Can seventh cousins share 54.7 cM of DNA?

I've found two people reported to be seventh cousins who share two autosomal DNA segments: Chr Start Location End Location Centimorgans (cM) SNPs 11 124,632,262 131,124,570 14.4 ...
7
votes
3answers
1k views

Where can I find a centiMorgans calculator?

When doing triangulation, I can end up with a segment shared among 3 in a GEDmatch compare where I have the cM for each pair of the three, but not the cM for the overlapping portion of the segment. I ...
7
votes
1answer
239 views

Why is GEDmatch report omitting some matches?

I ran a GEDmatch multi-kit analysis and got this report for Matches with Joseph's kit, for chromosome 12: And putting a different kit in first position, I get this report for matches with Charlotte: ...
4
votes
1answer
709 views

What is expected shared cM of double third cousins?

I've come across double third cousins, who are third cousins through two different routes as the same two families had two separate marriages between them that leads to this situation. For DNA ...
3
votes
1answer
9k views

What is expected shared cM of cousins with only one shared grandparent?

Related to What is expected shared cM of double third cousins?, what would the expected range and average shared cM be? In this case, I'm seeing 64.0 cM over 3 segments. Looking at the table, that ...
6
votes
2answers
1k views

Is a Chromosome 23 match less statistically significant for the same cM?

I've noticed that in comparing multiple autosomal kits, I often get a bunch of matches in chromosome 23 for various triangulation compares I've performed. It seems matches on chromosome 23 come up ...
5
votes
1answer
591 views

Why are the lengths GEDmatch.com Chromosome Segment Matching segments not proportional to their cM?

The GEDmatch.com Chromosome Segment Matching report has the following legend: One of my reports has the following triangulation match: The purple segment (< 5 cm) is 102912701 - 111046063 (4.189 ...
7
votes
2answers
290 views

Partial matches on Triangulated DNA segments

With DNA information from FamilyTreeDNA, I have determined trangulation groups. I have chromosome segments of significant size (> 10 cM) over which A (myself) matches B (my known cousin) and A (myself)...
4
votes
1answer
913 views

What settings to use in GedMatch to confirm a seventh generation relative sharing DNA?

I have a relative, Nancy Ann Trigg, who is 7 generations removed from me, so I expect I have one part in 2^7 (128) of her DNA in my autosomal DNA test. I want to confirm this relation and found ...