Perfet Charlap - YDNA Marker Trail Ends

On Geni, yDNA data is only applied 10 generations up from the profile that took the test.

Thanks Jonathan. Can you explain why this policy any further?

Here's the discussion where the information was originally shared:
https://www.geni.com/discussions/157595?msg=1092691

I believe this is due to yDNA markers mutating at different rates. Some markers can mutate within a couple generations and others are stable for dozens of generations. Since no one can safely assume a mutation hasn't happened, it's better to try not to falsely label results to a profile that was never tested.

Thanks, Jonathan. Unfortunately I don't have the time to read the 33 pages of comments at that discussion thread.

As for mutation rates, that is true, but why make 'ten' the cut-off? Why not five? Why not twenty? You see my point? Instead I would say let the marker run as far as it wants and put a disclaimer in the ydna details stating what you just said about varying mutation rates and that the ydna label 'may' be false.