Why is my DNA suddenly dropped in the Doty line?

+7 votes
123 views
I don't  understand why I show up as a DNA match for Daniel Doty-82 and his descendants, but I don't show up as a DNA match for Samuel Doty Sr., Doty-33 or his ancestors?
WikiTree profile: Samuel Doty
asked in WikiTree Tech by Ellen Kennedy G2G Crew (370 points)
retagged by Abby Glann

1 Answer

+11 votes
 
Best answer
Hi, Ellen. The relationship finder shows that you are the 6g-granddaughter of Daniel Doty (Doty-82) the son of Samuel Doty (Doty-33). That eight degrees of separation to Daniel is as far back as WikiTree will go to populate the "might share DNA with" entries.

When it comes to autosomal DNA, we have to think in a stepwise fashion, in terms of birth events rather than generations. It's about the mixing and dilution of the DNA, not about straight-line generational distance. With autosomal DNA and today's technology, it would be an almost certain impossibility to triangulate matches even to Daniel Doty, much less to his father Samuel. Contemporary descendants of Daniel would be 7th cousins to you, with whom you would share (assuming no endogamy or pedigree collapse) on average only 0.003% of your DNA, or about 0.2 cM...an amount too small to be reliably detectable. Studies have shown that even 6th cousins have only a 4.1% chance of sharing any detectable (valid IBD) DNA at all.

That's why WikiTree states that it accepts autosomal DNA as a form of evidence "within eight degrees of separation--up to sixth great-grandparents and out to third cousins."

And that's part of that is over-lenient because, of course, our Xg-grandparents don't have autosomal DNA test results on file. So we can only compare results to living or recently-living cousins. I personally think propagating those "might share DNA with" lists all the way out to 6g-grandparents is misleading and makes people feel there's some established DNA connection when there really isn't.

Happy detective work!
answered by Edison Williams G2G6 Pilot (176k points)
selected by Ellen Kennedy
Thank you so much for your explanation.

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