Jeff Malka wrote: "But elsewhere on the FTDNA website, when I click on any of my 12 marker exact matches it says it is a 30% possibility at 4 generations - which sounds a lot better!
Here is what comes up for any of my exact 12 point matches:
In comparing 12 markers, the probability that Mr. ...... and ..... shared a common ancestor within the last... Comparison Chart Generations Percentage 4 33.57% 8 55.88% ..."
Those figure are for the general population. Not for persons with Askenazic ancestry where persons with 12 markers matches all have a different surnames. What I did was to add 6 generations to the number of generations above to cover the 200 years since we began using last names.
