Snell Autosomal DNA

I don’t think I’ve written specifically about Snell Autosomal DNA. This DNA has been difficult to separate out. I have lots of 2nd cousins that lead back to our common great grandparents: James Hartley and Annie Snell. But it is difficult to separate out the DNA from those two. The best way to do this is to find someone who goes back before Annie Snell. Here is one apparent match before Annie:

This is actually a match to my sister Sharon. I asked the administrator for M.M. to upload to Gedmatch. I’m pretty sure this is the match:

About One Eighth of My DNA is Snell DNA

I get exactly one half of my DNA from my dad and one half from my mom. I get on average 25% of my DNA from each of my grandparents. It is that point that the numbers start to vary. I get on average 12.5% of my DNA from each of my great grandparents. At this level the 12.5% number varies even more. Here is how I have mapped me and four of my siblings on Chromosome 5 where the match is to MM:

The above maps my four grandparents to my DNA. Stated another way it shows how much DNA I got from my 4 grandparents and where I got that DNA on each of my chromosome. About half of each grandparent color should be split up into two great grandparent colors. The bottom part was done by Martin MacNeill. I created the top part with visual phasing. I assumed that the bottom part was correct. There are some discrepancies of where the crossovers occur due to scale. My crossover from Hartley to Frazer is at 172.6. That explains why I don’t match M.M. If I take Gedmatch way down, I actually do match M.M. here:

If I was mapping this tiny segment, I could say that it came from either Anthony Snell or Betsey Luther. If I wanted to limit it to one person, I could say that this is my Otis Snell DNA [Anthony and Betsey’s son].

It is difficult to see, but there is now some new light blue at the end of my Chromosome 5 for Otis Snell. For my siblings, they would have longer patches of blue. Actually, this would be true for all my siblings except for Lori. She doesn’t match M.M. This means I made a mistake on my Chromosome Sibling Map. It should look like this:

Matches are a good way to check your work. Lori’s last crossover from Hartley to Frazer (Yellow) is at about position 167.5M.

What About Other Snell DNA?

One way to find other related Snells is through a Gedmatch utility. This utility finds people that are matched to both you and your match. Here are a few that match my brother Jonathan on Chromosome 5 :

Unfortunately, I either couldn’t find these people with overlapping DNA matches easily or they had a tree that didn’t go back far enough.

Snells at Ancestrydna

Here is a match that is perfect at AncestryDNA. Our common ancestors are the parents of Annie Snell [Isiah Hatch Snell and Hannah Thomas Bradford]:

I have gone to his mother on the chart above. However, he hasn’t uploaded to Gedmatch.com for comparison. And there is the problem for genetic genealogists. AncestryDNA has good information but no chromosome browser and tools. Gedmatch has good tools but not as many people and the trees aren’t as good.

So for now, I will be content with my little bit of DNA that I got from Otis Snell’s parents on my Chromosome 5.

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