Knowing that someone has substantial Ashkenazim ancestry lets you make many probabilistic predictions about both neutral and significant genetic variations
Yes, that’s what I meant—they’re an actually close-knit genetic group. “Negro” is not. “Black American” is a little closer, but not much (their African ancestors having been taken as slaves mostly from the west coast) - you’ll see obviously highly selected-for factors, like black skin and sickle-cell.
There are people who identify as black or who are identified as black under a “one drop” rule. This doesn’t seem as though it would give huge amounts of information about associated traits.
Yes, that’s what I meant—they’re an actually close-knit genetic group. “Negro” is not. “Black American” is a little closer, but not much (their African ancestors having been taken as slaves mostly from the west coast) - you’ll see obviously highly selected-for factors, like black skin and sickle-cell.
There are people who identify as black or who are identified as black under a “one drop” rule. This doesn’t seem as though it would give huge amounts of information about associated traits.