Author Topic: MyHeritage cluster omission  (Read 176 times)

Offline Petros

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MyHeritage cluster omission
« on: Monday 19 April 21 10:36 BST (UK) »
One of the clusters I get contains 3 individuals at 35, 28.1 and 26 cM.  On looking at each match all share a 4th match A, at 41.8 cM, and each triangulates with A  and me to chromosome 14.

I have been able to identify A as a 5th cousin but why does he get omitted from the cluster?

Offline Gadget

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Re: MyHeritage cluster omission
« Reply #1 on: Monday 19 April 21 10:47 BST (UK) »
A similar problem came up a while ago. 

This is what My Heritage says about it:

Segments that seem to be shared by three or more people are not necessarily triangulated. For example, if you compare yourself with two people, call them A and B, you may see that you share a segment with A and you share a segment at the same genomic position with B, but A and B may not match each other on that segment. Thatís because you may be sharing your maternal segment with A and your paternal segment with B and A and B arenít related to each other at all.
If a match is shown as triangulated, it means that you, A, and B, all match each other precisely on that segment, and therefore all of you are probably related, and you probably got that triangulated segment from the same common ancestor.

It could be the cause.

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