This Blog follows up on my recent Blog on Pouliot DNA. My in laws have French Canadian Pouliot ancestry. I was able to find some Triangulation Groups (TGs) using known relatives and a more distant Gedmatch relative, Robert.
Here is the TG in spreadsheet form:
Richard is my father in law. Virginia is his sister. Patricia is their maternal 1st cousin.
Here is the TG in genealogy chart form:
Here is Robert’s match with Richard (1) and Virginia (2) on Chromosome 3:
It looks like I am seeing a crossover for Richard and Virginia already. Can you see them?
My premise in this Blog is that TGs and Visual Mapping should work well together.
Visual Mapping Starts By Comparing At Least Three Siblings
Those siblings are Richard, Lorraine and Virginia:
The crossovers got a little messy at around 151M. There seems to be a lot going on there. I’ll start the mapping by the largest Fully Identical Region (FIR) in green and hope that I can resolve the other mess later.
The blue and green represent the DNA that Lorraine and Virginia received from the same two grandparents in their Fully Identical Region. Lorraine has no crossovers in the first part of the Chromosome, so I expanded her DNA to her first crossover at 155M. Note also above in the match between Lorraine and Richard. I ignored the small match that they had after 70M.
This is what I call the Swiss Cheese part of the Visual Phasing:
adding a HIR to the map
According to Kathy Johnston, I have one shot a creating a HIR. This will set the paternal and maternal sides. I would like to set it between 70 and 133 as I have a known Pouliot match there.
time to look at some cousin matches
At this point I like to look at real world DNA matches with cousins. Here is the visual phasing map with Robert’s matches below. He is a 4th cousin, twice removed to these 3 siblings.
Robert’s longer match (1) is with Richard and the shorter one (2) is with Virginia. That sets the purple as Pouliot. I can imagine Robert’s yellow matches from the Gedamatch Chromosome Browser fitting right into the Visual Phasing Map above the Browser. That means that the large blue stretches can be assigned as LeFevre DNA. I don’t know about the paternal side as there are no reference matches – yet.
Bring in the 1st cousins and nephew
Here John is a nephew, so he may match on the paternal or maternal side. Patricia and Joseph are 1st cousins on the mother’s side. It looks like with all these matches, we should be able to figure out something.
The first thing I notice is that Richard has a maternal crossover at 12M. How do I know this? Because if he didn’t, he would continue to match Patricia and Joseph to 72 as his two sister did.
Here I added in Richards maternal crossover at 12M on the top bar. Then as Richard and Virginia are fully identical from 0-12M, I made their two colors the same in that segment.
Also, as Richard does not match Patricia nor Joseph from 33-60M and Patricia and Joseph match Lorraine and Virginia in that stretch, Richard got his DNA from Pouliot in that region and a green segment can be added below that.
Lorraine matches her 1st cousin Patricia from 157-184M. Assuming the small segment I have before 176M is correct, then the whole maternal Chromosome will be from LeFevre for Lorraine. However, that created an odd result. When I checked my numbers, I see that I had the last crossovers mislabeled. Here are the correct numbers:
This makes sense as I thought that I was seeing more crossovers at higher numbers. Lorraine and Virginia both match Patricia from 190-195. That must be LeFevre if I have it mapped correctly.
This puts Lorraine’s last crossover on the paternal side. Then I put the opposite colors in for Richard as Lorraine and Richard have no match in that area. As Richard has no crossovers in that area, I carried his segments to the left. Lorraine have no match in Lorraine’s last open space. That calls for opposite colors. Then I can fill in Virginia’s teeny tiny blank space as it appears that she doesn’t match Richard there.
Here is the filled in Chromosome 3 with maternal grandparents identified:
Observations
- The previous Pouliot Triangulation worked well as an aid in mapping this Chromosome and identifying maternal grandparents
- First cousin maternal matches were a big help in filling in the missing segments and identifying crossovers
- Lorraine has a long stretch of green which may help in identifying the paternal grandparents.