swid wrote:Genetic genealogy is an interest of mine and there are a lot of folks of colonial American ancestry who go all in on it - the tl;dr version is that the consumer-level autosomal tests (Ancestry, 23andMe, etc.) have a very hard time reliably distinguishing NW European ethnicities apart, as (surprise!) they're all *very* similar to each other.
Y-chromosomal tests can be more informative on deep ancestry, but that's only one line of ancestry.
Is fascinating how slight changes in genetic mutations work and makes a lot of sense in identifying the markers they use to track migrations. The understanding of these occasional slight changes along with Africa having the most genetic diversity and everywhere else is a subset pretty much conclude we all ultimately come from Africa/Arabia area. So what does ancestry really mean... whatever era(s) you embrace apparently.
BTW, one interpretation of how humans developed light skin is that when Africans migrated to Caucasus Mountains/Caspian Sea area 40K+ years ago, it took about 10K years to evolve lighter skin - due to the constantly overcast environment. The lack of sun caused the skin to lighten over many generations in order to make more Vitamin D from the UVB rays. Something to that effect.