I’m the family genealogist & had my brother do an Y-dna (paternal) test & we found out that my dad’s side was R1a & Jewish. No one was aware of it & in checking Ashkenazi Jews I found that they are at an increased risk of having colon cancer. I regret not knowing this information way back in the 70’s as my father died at age 54 of colon cancer in 1981. Having this information was too late for my family but maybe it will help someone in the future.
80% of the Jewish immigrants to the US are the Ashkenazi variety.
As a group, they have the highest IQ's in the world.