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Ancestral Family Tree DNA Testing / Can someone explain this please
« on: Tuesday 03 October 23 13:30 BST (UK) »
I have been using DNA painter and Chromosome browsers to map my matches. I have solved one brickwall and thought I understood how it all worked until the following result
I have a match on MyHeritage of 21.7 cmgs on chromosome 16 and a match on Ancestry with her daughter of 22cmgs and eight other shared matches ranging between 33cm and 17 cm on Ancestry, six with trees have the same common Ancestors. Ancestry assigning them to my maternal side
So far so good
I then get contacted by the first matches first cousin(DFH) on Ancestry. There we do not match, but on GEDMATCH we have a 7.1 cmg match on Chromsome 15. This segment on my maternal side is a subset of a known match(SH) that I have all ready painted. So I am thinking right I know what line this group must fit into my tree
But when I run a 1:1 on GEDMATCH between DFH and SH they don't match, unless I drop the minimum segment cm limit, when there is a 5.3 cm match on Chromosome 17 nothing on 15
DFH has the same common ancestors as the others in her tree.
The only thing I can think of is that she matches me on my paternal side not maternal( hence the duplicate segment with SH is irrelevant), and that either she hasn't inherited the DNA that I have from the common Ancestors or there is an NPE and her tree is wrong
What do people think?
Andrew
I have a match on MyHeritage of 21.7 cmgs on chromosome 16 and a match on Ancestry with her daughter of 22cmgs and eight other shared matches ranging between 33cm and 17 cm on Ancestry, six with trees have the same common Ancestors. Ancestry assigning them to my maternal side
So far so good
I then get contacted by the first matches first cousin(DFH) on Ancestry. There we do not match, but on GEDMATCH we have a 7.1 cmg match on Chromsome 15. This segment on my maternal side is a subset of a known match(SH) that I have all ready painted. So I am thinking right I know what line this group must fit into my tree
But when I run a 1:1 on GEDMATCH between DFH and SH they don't match, unless I drop the minimum segment cm limit, when there is a 5.3 cm match on Chromosome 17 nothing on 15
DFH has the same common ancestors as the others in her tree.
The only thing I can think of is that she matches me on my paternal side not maternal( hence the duplicate segment with SH is irrelevant), and that either she hasn't inherited the DNA that I have from the common Ancestors or there is an NPE and her tree is wrong
What do people think?
Andrew