DNA lineage stoppage

+5 votes
Apparently, I share DNA with my ancestor,  Leonard Cooper II (1730-1775), and his wife Mary Polly Cooper.

My question is, why does it not show that I share DNA with either of their parents?  When I click on Leonard's father, under DNA Connections, my name does not appear under either Leonard's father or mother.

Can someone help me understand?

Thank you so very much!
WikiTree profile: Leonard Cooper
in Genealogy Help by Rebecca Markham G2G1 (1.3k points)
retagged by Ellen Smith

3 Answers

+8 votes
Your DNA information that's shown on those profiles is for autosomal DNA. We get half of our autosomal DNA from each parent. As a result, we share approximately half of our DNA with each parent, 1/4 with each grandparent (or an aunt or uncle), 1/8 with each great-grandparent (or first cousin), etc. WikiTree only displays our autosomal DNA information on profiles of people who have a reasonable chance mathematically to share DNA with us.

(For reasons related to how the software calculates relationship distances for this purpose, Wikitree doesn't extend matching information to the profiles of fourth cousins, who may have discernible DNA matches, but your question is about ancestors.)
by Ellen Smith G2G Astronaut (1.2m points)
You get half (that would be 50%) from each parent but I'm pretty sure you do not get 25% from grandparents.   It's a random selection of your parents DNA.

So after a few generations (or even less) you MAY have almost no dna from certain of your grandparents and a lot from others.  That's nature - isn't it fascinating.
+2 votes
The point is, it only goes out just so far, and the fact that it doesn't go out as far as you'd like to see in this case doesn't really mean ANYTHING, regarding whether your claim to share DNA with this ancestor is right or not.

It's just a rule of thumb, and the point is undoubtedly to avoid having an unwieldy list of individuals who might share DNA with an individual, even while only a few of them really will.
by Frank Stanley G2G6 Mach 6 (67.0k points)
I think it actually goes 8 generations. So some of the people on the DNA list for this guy appear on the list for his father - and these would be the people at least one generation above you on the tree. When you go to the grandfather, only one person appears in the DNA section - so that person must be two generations above you (in your grandparent's generation).
+2 votes

I see your autosomal DNA listed now among the possible descendants of Leonard Cooper.  

It takes about 24 hours for the DNA reports to percolate up the tree after you enter the DNA result for yourself.  You seem to have been successful.

by David Brodeur G2G6 (6.2k points)

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