Problems with DNA Descendants View

+5 votes
92 views

Overall, the DNA Descendants View is a useful tool and has helped me keep track of expected Y and mtDNA matches.  However, I have noticed that there are issues with the view, particularly with dropping certain lines of descent.

Let's take the example of my direct paternal lineage exactly 10 generations back, which happens to be the immigrant from France to New France.  The DNA Descendant view of René does include many lines of descent down about 10 generations, but for my own it consistently stops at my great great grandfather, Siméon Lavoie.  I am ultimately able to find a view that incorporates my most recent paternal ancestors, but only by viewing it at René's great grandson, Louis.  In contrast, I don't seem to be having similar problems on my mtDNA side.  Viewing the mtDNA descent of my immigrant ancestor, Marie Sédilot, I don't have any difficulty finding my maternal grandmother (the number of generations from Marie to me is 12, rather than 10).

It is possible to get an error message of sorts if you choose someone who has too many descendants with DNA tests.  One such example is the mtDNA descent of Marguerite Langlois.  However, no such error message is displayed when I view the Y DNA descent of my paternal 8th great grandfather, which makes me think that there is a more subtle programming issue that ought to be addressed.

in WikiTree Tech by Greg Lavoie G2G6 Pilot (318k points)
retagged by Jamie Nelson

1 Answer

+7 votes
 
Best answer

It is a bug which was first reported in Oct 2018..See this thread https://www.wikitree.com/g2g/694815/need-help-understanding-10-generation-dna-descendant-chart?show=694815#q694815

You will find it on the trello board listed currently as "working on"  https://trello.com/c/Ry3xDlou/138-y-dna-descendants-chart-does-not-show-everyone-that-it-should

by Karen Raichle G2G6 Mach 7 (75.2k points)
selected by Lynden Rodriguez
We're kind of stumped on this bug, but more examples (such as what Greg posted) are always helpful!

Karen-thanks for linking back to your initial post about issues with the DNA Descendants View.

Jamie-I can confirm that the issues are not limited to Y-DNA, but also extend to matrilineal descent as well.  For example, the matrilineal descent of Emilie Rau is missing from the mtDNA descent of Marie Sédilot, despite being within 10 generations.

Jamie, Here's another example of a problem with the yDNA Descendants View: For the yDNA descendants of Thomas Smith-15895, one of his lines stops at Elford Hiram Smith-54159 (1845-1928), but by clicking on Elford's descendants on his profile you can see that the line continues on down to Len Smith-81508.
Thanks :)

Related questions

+9 votes
3 answers
331 views asked Dec 3, 2020 in WikiTree Tech by Ros Haywood G2G Astronaut (1.2m points)
+6 votes
1 answer
167 views asked Jul 7, 2020 in WikiTree Tech by Linda Peterson G2G6 Pilot (534k points)
+8 votes
2 answers
235 views asked Jun 23 in WikiTree Tech by Julie Kelts G2G6 Pilot (434k points)
+6 votes
3 answers
215 views asked Jan 29 in WikiTree Tech by Ros Haywood G2G Astronaut (1.2m points)
+7 votes
1 answer
+18 votes
2 answers
504 views asked Dec 30, 2020 in WikiTree Tech by Herbert Tardy G2G6 Pilot (640k points)

WikiTree  ~  About  ~  Help Help  ~  Search Person Search  ~  Surname:

disclaimer - terms - copyright

...