In my last Blog, I looked at Chromosome 15. This is because I took Chromosome 16 out-of-order by mistake. On to Chromosome 17,
Chromosome 17
Here is my first cut:
The first four crossovers are fairly close together. However, Chromosome 17 is much smaller than Chromosome 1. The spreadsheets are all the same width. That means that the spacing is further apart on the higher numbered chromosomes. That makes the crossovers easier to see.
Next, I take a second look and enter the crossover positions in a spreadsheet:
I needed the first four positions during my first look to get the order of the crossovers right.
Cousin Matches
I like this part of the process as it makes things go faster and shows crossovers. Hartley 1st cousin once removed Joyce is the best match for these six siblings:
Joyce’s matches point out two paternal crossovers for Jon and one for Lori. This is what I get for Joyce’s matches:
[Note here that I added orance Hartley on the Lori’s first segment by mistake. This is corrected later in the Blog.]
I didn’t fill in between Lori’s L and L segment. That is because Lori has two crossovers and could go from Hartley to Frazer and back to Hartley again. Sharon and Heidi had only one crossover each and would have needed two to go from Hartley to Frazer to Hartley. As they only had one crossover each, I filled in the gap between the two Hartley areas of DNA with more Hartley DNA. Jim had no crossover in that area, so I was able to fill in his gap with Hartley DNA also.
A Maternal Match
If I have a maternal match, it may be enough to solve the Chromosome. Lentz cousin Judith matches three siblings on the right-hand side of Chromosome 17:
There are not many crossovers, so I can expand the DNA to the right. I also gave Rathfelder DNA to Sharon, Heidi, and Lori on the right as they didn’t match Lentz cousin Judith.
Lori has the most crossover, hence a few blanks. To fill in the blanks I go vertical. That means I go up to where the Gedmatch sibling pair comparisons are. However, before I do that, I take a glance at the Segment Map. It looks like I have at least one mistake. By reviewing my map, I see this:
I missed a crossover for Jim (V) at the pink circle. I was going from right to left, so I’ll erase Jim’s maternal DNA to the left of the circled crossover. I had already added Hartley to the left of the V crossover based on a match with Hartley cousin Joyce. That means that the crossover at the circled area should go from Rathfelder to Lentz going right to left.
I can shrink the Segment Map very small to see that I have fixed the problem:
Going Vertical for Lori
Now I can go above for Lori to fill in her missing DNA with FIRs and NIRs. Here is an issue:
The Jon (F) and Lori comparison has a green FIR at the top of the image above for the first segment. That means that Lori should have Frazer/Lentz DNA, but I have her with Hartley DNA already. I had added that above by mistake. Lori does not match cousin Joyce in that segment and should have Frazer DNA there:
Next, if I have Lori’s paternal side right (which I didn’t before), she should go from Lentz to Rathfelder and then back to Lentz on her maternal side. Then at the last L crossover above, she would go back to Rathfelder.
On my computer, this is the solution to Chromosome 17 at 40% size:
To quote an old joke, “I thought I made a mistake once, but I was wrong”. I thought I saw an error, but I’m not used to this comparison. When I look more closely the top and bottom of the image above match.
My Previous Attempt at Chromosome 17
I first started working on Chromosome 17 in January of 2016. This is what I came up with:
At the time, I was working with three siblings and didn’t have as many cousin matches.
Here is the new analysis. The colors are different and the maternal and paternal are reversed. Not only that, the sibling order is different:
There are also more crossovers in the newer version due to twice as many siblings. However, despite all the differences, the results were the same. It seems a bit ironic that I used the same colors that Fox adopted for his spreadsheet.
Summary and Conclusions
- I missed one of Jim’s crossovers, but was able to fix it.
- I wrongly assigned Hartley DNA to Lori, but I was able to find that error and fix it.
- Jim, Sharon and Heidi have full Hartley DNA on the paternal side of their Chromosome 17.
- Joel has a full paternal copy of Frazer.
- Sharon and Heidi have full Rathfelder maternal copies of Chromosome 17.
- When looking for Frazer or Hartley matches on Chromosome 17, I know the best people to go to to look for matches.
- Between all six siblings we recieved the full amount of DNA from our four grandparents.
- A comparison with an earlier attempt I did at solving Chromsome 17 for three siblings matches with my current results.