In my last blog I took a look at the DNA my 2 sisters and I inherited from our grandparents. This was based on how we matched each other, where our crossover points were and whether we match by Half Identical Region (HIR) or Fully Identical Region (FIR), or not at all. I wasn’t totally satisfied with the result but noted that Chromosome 1 was probably the most difficult to analyze as it is the longest Chromosome. I still need to tweak this Chromosome a bit. Another way to figure out where the segments are is by looking at Triangulation Groups. On my Hartley (green) line below (horizontal line J), I have a TG going through the little orange segment at position 203, so the orange is likely not correct there.
Part of my reason for choosing this Chromosome was to show how my sister Heidi was in a Triangulation Group (TG) for Richard Frazer b. 1777 starting at position 205 and my other sister and I were not. My best shot at splitting up Chromosome 1 looked like this:
James above is my father’s 1st cousin and represents the Hartley line. Jane is Jane from the Frazer DNA Project and represents the Frazers. This is the segment where Jane matches my sister Heidi.
And here is what the Frazer TG looks like:
Note that the TG for Heidi’s matches starts at position 205 million. That is where Heidi’s Frazer segment starts above. MFA and Jane’s match with each other start earlier than that, but they have a different segment map than my family does, so that is OK.
Chromosome 12
Chromosome 12 is where all my siblings are in another TG for Richard Frazer b. 1777. The map for that is a bit cleaner and more simple. As Chromosome 12 is shorter than #1, there are fewer segments and crossover points.
- Note that Sharon has all Frazer on this Chromosome. That means that on her paternal side, she only inherited DNA from her Frazer grandmother, Marion Frazer
- The TG representing Richard Frazer b. 1777 was again on the right hand side where my 2 sisters and I have Frazer (blue) segments
- This TG is from position 124 to 129 and includes myself, both my sisters, and David, Bill, and Jane from this DNA Project among others.
- The colors are reversed from what I had on Chromosome #1 as those colors are only relative until we find the grandparent that matches the color. At that matching time, we discover which side of the line is maternal and which side is paternal. For Chromosome 12 my paternal side is on the bottom.
I got the relative colors of the segments from these sibling comparisons:
The procedure I used was in my previous blog. The names I got from looking at my matches to cousin Paul. I didn’t have enough matches on my mother’s side to nail those grandparents down. Those were the orange and green colors.
On To the James Line
Joanna and I wisely (or more likely luckily) had 2 of our siblings tested for autosomal DNA. This means that I am able to do the same analysis for her. As we know in the Frazer DNA project, her line starts with James Frazer as opposed to my side which starts with Archibald Frazer. They were both born in the early 1700’s as they had families and farms in North Roscommon, Ireland in 1749.
Chromosome 2
My 2 sisters match Joanna’s brother on Chromosome 2
Here is how Joanna’s family lines up compared at gedmatch.com
Jonathan has more than the usual matches with his sisters. Janet and Joanna have only one long match made up of HIRs and FIRs. This is looking complicated already! Now lets see where all the crossover points are and who owns them. I had to give numbers to the family due to overuse of the initial ‘J’ in that family.
As we might’ve suspected by the number of matches between the family, there are a lot of segments and crossover points. I had a little trouble with Janet’s (who I have as #2) third crossover point, but moved the line a little to the right (judgement call). This could be challenging. I’ll start by adding the bottom left FIR match between Janet and Joanna and see where that leads:
I got this far, but I got a lot of position numbers due to all the little matches between the family. I’m really interested more in the right side of the Chromosome, so I’ll start over on the 3rd FIR match between Janet and Joanna:
That’s not even as good. I think I’ll try the upper right Jonathan to Janet FIR match, as that is the only FIR match Jonathan has. Plus this is even closer to the area of the Chromosome I’m interested in.
Now here comes the critical move to the right of the orange-purple area. Jonathan has a half match in that area with Janet. So I’ll extend the purple and green to that area to create the half match. It’s critical, because way back I said that Jonathan had a match with my 2 sisters from 205 to 222. Once I extend the purple that has to be the Frazer area as the match wouldn’t go through two different grandparent segments (i.e. orange and green at the top right).
Here I added Edward Frazer who is Joanna’s paternal grandfather (actually b. in 1867). Because we identified Edward through a match between Jonathan and my sisters, the other person on that line in blue has to be Joanna’s paternal grandmother Seymour. In order to figure out Joanna’s maternal grandparents we would need to have matches through known relatives on those lines.
Now I’m stuck as the segments are HIR and I would have to guess. Here’s my guess for Jonathan, Janet and Joanna on Chromosome #2
This means if I am right and Jonathan, Janet and Joanna are looking for Frazer matches on Chromosome #2:
- Jonathan should look between 9 and 129; 142 and 219 and 241 and over (these are positions all in millions)
- Janet would look for any thing under 119 and over 238
- Joanna would look before 27 and between 129 and 152
However, the catch is to make sure the match isn’t on the maternal side. However, it should be possible to double check this using Triangulation Groups (TGs). These TGs will fall within the segments as shown above.
How My Family Compares to Joanna’s Family On Chromosome 2
Unfortunately, the colors don’t match up. Joanna’s Frazers are purple and mine are green. As can be seen above, my sisters got their Frazer DNA in the area of around 200 where I got Hartley DNA as shown in orange. This explains the matches between Sharon, Heidi and Jonathan.