First, I’ll take a rough cut at setting the crossovers for Chromosome 8. Things went fairly smoothly until I got to the last S Crossover:
At F&L and H&L, we go from an HIR to an NIR (Non-Identical Region). My guess is that Lori has a double crossover in this area. This may be where a spreadsheet of crossovers could help. This is as far as I got:
For the boxed area above, I want to create an even more detailed spreadsheet of all the changes. Some of the positions, I can get off the above image:
The first column has the initials of the two comparisons. The second column has the position of the changes from HIR, FIR, or NIR. The third column is who I think the crossover goes to. In blue, DH and HL are both at 104. These both have H in them, so it appears that the crossover could go to Heidi. Above, VL and FL both are at 103.1 and have L’s, so it appears to be a Lori crossover, but there is a change in the FD comparison at 103, so I want more information before I decide. To fill in the other positions, I need to look at the full resolution comparisons at Gedmatch. The first is Jim and Jon (VF).
Each ^ is one M, so this is at position 103M.
To me, it looked like there were two changes in the Jon and Sharon FS comparison:
The first is at 101.5M and the second at 103M. That means that Jon (F) may have a crossover at 103M.
I also see two changes between F and H:
They are at 103M and about 103.8M.
Here is the change from FIR to HIR to NIR between F and L:
Again, I see 103M and about 103.2M.
Here is DL (Joel and Lori compared):
This change is just past 103M, so I’ll call it 103.1M to distinguish it from all the other 103 changes.
For Sharon and Heidi, it is a little difficult to read the changes:
It looks like the first change is at 100.5M, but it is actually at 101.4 as there is a quick ^ after the 100M mark. That means I have to change the other 100.5’s on my spreadsheet to 101.4’s.
I double checked all the positions and sorted the results by positions. That gave me this:
This gives me confidence that I have crossovers S, F, L and H – in that order. I had mentioned the possibility of a double crossover for Lori, but I’ll add that later if needed. That was a bit of work, but it gives me some confidence in who has what crossover and where. Here are the crossovers I get:
Hartley Side Cousin Joyce
Cousin Joyce’s matches line up with the crossovers that I had. However, the match numbers suggest that the S and H crossovers are in the wrong order for Sharon and Heidi. I suppose to know for sure, I need to look up more full resolution comparisons:
Unfortunately, the results are less than conclusive. However, I would say that the H should be before the S. This is based on matches with Joyce and most of the comparisons above. I’ll say that Heidi is at 11.3 and Sharon is at 11.5. Here is what I finally fill in from Joyce’s match:
I made some assumptions that there would be Frazer DNA where there was not a Hartley DNA match.
More Hartley Cousins: Maury and James
Here I see a crossover for Jon in the Cousin James matches. I also see that my (Joel’s) Hartley DNA carries through the middle of the Chromosome.
The Frazer DNA probably carries to the middle of the Chromosome for my siblings, but I have not added that DNA in yet.
Lentz Cousin Carolyn
Carolyn gives me some maternal Lentz DNA on the right hand side of Chromosome 8:
Again, I filled in Rathfelder for those who did not match on Lentz.
Lentz Cousin Linda
Linda adds some green to the middle of the Chromosome:
Jon Matches Two Rathfelder Cousins
Both cousins match Jon in the same place so I only show Cousin Catherine:
Checking the Segment Map
This is the non-controversial middle part of the Chromosome, so I would suspect that I would have agreement between the Segment Map and the Gedmatch Sibling comparisons:
Working to the Left of the Chromosome
Getting Through Four Crossovers in a Row
Assuming my four crossovers were right:
I see only one obvious mistake:
The F&H Line is off starting at the H (Heidi) Crossover. Also the S&H comparison line is off. And they are off by quite a bit. They should be FIRs and they are NIRs. Heidi should have the same DNA as Jon (F) and Sharon, but I show her have the opposite DNA on the paternal and maternal sides.
It occurs to me that Heidi’s Paternal Crossover should be a Maternal Crossover.
If I make that change, then Heidi would match Jon and Sharon:
The Final Answer for Chromosome 8?
I don’t see any obvious errors:
Summary and Conclusions
- My mother didn’t pass down some of her Rathfelder DNA to any of her six siblings, so we will have to depend on her DNA results for those areas.
- I looked up full resolution positions for changes between sibling comparisons in areas where there were multiple crossovers or close crossovers. This helped resolved problems.
- I hope to use this technique to solve my problem Chromosome 6
- I found out that changing one crossover from paternal to maternal could be the difference between an FIR and NIR comparison between two siblings.