Why Don’t the Segments Triangulate

Have you ever used the MyHeritage chromosome browser to view triangulated segments? It's a wonderful tool. A member of the Research Like a Pro with DNA study group asked a great question about his experience using it. He said:

I've compared the DNA of 3 people with my mom: Bob, my mom's 1st cousin on her dad's side; and two DNA cousins I'm researching, Jane and Jill (names changed). Bob triangulates with Jane on chromosome 15. Jane triangulates with Jill on the same segment on chromosome 15. Bob does NOT triangulate with Jill on chromosome 15. Shouldn't Jill and Bob triangulate?

Nicole Dyer, professional genealogist at Family Locket, shares the answer.

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Here are some resources discussed in the video:

Esther, “MyHeritage DNA: Your Questions Answered,” 9 Nov 2016, MyHeritage Blog (https://blog.myheritage.com/2016/11/m... : accessed 5 May 2022).

“How DNA Testing Works,” 21 May 2019, MyHeritage Knowledge Base (https://education.myheritage.com/arti... : accessed 5 May 2022)

Jim Barlett, “Triangulating Your Genome,” Segmentology, blog post, 29 Dec 2020, https://segmentology.org/2020/12/29/t... : accessed 14 May 2022).