The last two Chromosomes (13 and 14) went well. We will see what is in store for Chromosome 15. Actually, I see that I have been working on Chromosome 16, so I’ll go with that.
Chromosome 16
After a break with the two easy Chromosomes, it looks like I am back to a bit of a challenge:
I have two difficult areas, signified by lack of siblings’ initials.
Cousin Matches – the Easy Way Out
It is my hope that cousin matches will define some of the confusing crossover areas. I’ll start with Hartley cousin Maury:
Maury shows that Jim has a crossover at 72.3 in the second problem area.
Once I saw that crossover, it appeared that there was only one other crossover (for S). This is what I get:
Back to Maury
That is what I get out of Maury’s match. I note that the end of Maury’s first match with Lori is at 20.1M and the end of the other matches is at 21.1, so there is a possible crossover for Lori there. I’ll hold off on that for now until I find other information.
Matches with Rathfelder cousin Anita fill in some maternal DNA:
Matches with Lentz cousin Joan give the other side of the maternal coin:
Figuring Out the Two Missing Crossovers with a Detailed Analysis
The first step is to look at the V & H comparison at Gedmatch full resolution:
This gives the positions of the crossovers at 20.4 and 21.6.
The V & L comparison has two very close changes:
This is because Jim (V) and Lori go from NIR and quickly to an FIR with a small FIR in the middle.
Here are the results:
The FD and DL are for the crossover for Joel (D) that I already have. I interpret the other matches to mean that there is a close double crossover for Jim (V). One is at 20.3 and the other is at about 21M.
Expanding Around the Double V Crossover
My next strategy is to work around Jim (V). This is because I’m not totally sure of the two crossovers.
I’ll use the gedmatch sibling comparisons to expand the DNA more:
At this point, I see that Jim (V) and Heidi are NIR in the larger missing segment above. That means that Jim needs to be Hartley /Rathfelder there which agrees with the proposed double crossover for Jim (V).
I don’t know how to fill in the little V-V segment. This would have to be either Frazer/Rathfelder or Hartley/Lentz. If it was Hartley/Lentz, then Jim would be FIR with Jon, Joel and Sharon in that little segment.
Here is Jim and Jon:
Here’s Jim and Joel:
Here’s JIma and Sharon:
The question is: Is there a FIR between about 20.8 and 21.2M? I can’t tell, but I’ll say there is:
Basically, it is not a big deal either way, so it’s a judgement call.
Here’s my crossover list:
After working the DNA a bit, I get this:
This comparison between the Segment Map and the Gedmatch sibling chart confirms Chromosome 16
Summary and Conclusions
- Once the crossovers are accurately identified, it is fairly easy to solve the Chromosome.
- Lori and Joel got a full dose of Hartley. Heidi got a full dose of Frazer.
- There is a small segment of Rathfelder DNA missing.