This blog follows up on my first blog about the autosomal DNA of the Frazers of Ireland. In that blog, I established that there were 2 Triangulation groups of Irish Frazer descendants. These matching groups were at Chromosome 1 and 12 and they represented the common ancestors of Archibald Frazer and Mary Lilly. Now, from what I’ve been able to gather, Archibald was born about 1743. My sister Heidi and Jane Fraser share a whopping 43.7 cM of DNA on Chromosome 1 from one of this 18th century couple who lived in Northern County Roscommon. That is a lot of DNA to come down through all that time.
Next I looked at Chromosome 12 Triangulation Group. Below is my sister’s chromosome browser. I put myself in for fun. It shows the large match I have with her. Below me is David who has an Irish Frazer ancestor named James that we showed must have a common ancestor with the rest of us due to Triangulation. Below him are Jane Fraser and Bill Richards.
What Did We Learn?
We learned that the 2 triangulation groups lead us to 2 different ancestors. We don’t know that they are Archibald Frazer and Mary Lilly for sure, but as they are the 2 closest common ancestors for this group, they are a good guess. The triangulation can’t tell us who the ancestors are. The paper research can, but we aren’t always sure we got the right information with missing vital records going back that far. Together, we have a good case that we are on the right track. And we have learned that Heidi and Jane are carrying around a lot of DNA around from 18th century Ireland people!
By the way, my genealogy web pages are at the link below. See under PART II: THE FRAZERS AND IRISH ANCESTORS; then look under the Archibald Line for Archibald Frazer and Mary Lilly:
We also learned that there are matches to these Triangulation Groups that don’t know that they are related to the Groups, but the DNA is showing that they are related in some way and share a common ancestor or ancestral pair. This should help others if they are looking for places to direct their family history research.
A Few Side Notes
You may have noticed that I didn’t inherit the Frazer DNA on Chromosome 1. Where did it go? I don’t know. That DNA lasted 200 years and then decided to drop out while my parents’ DNA was combining to form me. My father had that same DNA and gave it to my sister. That is a good reason why it helps to have more than one person in the family tested for DNA.
Other side note: See the red line above that represents my match with my sister. Does this mean that all the people I match from the beginning of the red line to the end are Frazer matches? Or are my Frazer matches only in the region at the right side of Chromosome 12 where the green is? I think that the entire red area are Frazer matches. I don’t mean that they all match Archibald and Mary. I mean that they should all match my Frazer Grandmother. I should have inherited roughly 25% of my DNA from her. In order to check this, I looked at a match I have with my father’s non-Frazer cousin – related on my Hartley side.
Well, look at that. Chromosome 12 shows no Hartley DNA in common with my father’s cousin and me. That leaves room for Frazer DNA. Also note that my match with my sister in red above was all one large segment. I will have to test it out, but it appears that all the matches I have that are on my father’s side where I also match my sister on Chromosome 12 should be related to my Frazer grandmother and her ancestors.
Well I think this blog has taught me something. I hope that it has been helpful to you.