gourimoko
Fighting the good fight!
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White and black is a construct and a poor label (like Asian) when it comes to genetics. However, genetic ethnic groups do show certain pre-dispositions.
Right, precisely; this is actually the point being made -- the term "Black" and "White" here makes almost no sense. You must discuss these concepts from the standpoint of actual ethnic background -- and for African-Americans, that's almost impossible without personalized individual study of their genetic makeup.
East Africans are very good at marathon running not only because of cultural influences, but because they have mutations on their red blood cells that give them superior endurance via enhanced oxygenation.
As Jigo pointed out, Nordic populations show a pre-disposition toward extreme upper-body strength. And, for some reason, 5% of the Nordic population has an immunity to HIV thanks to some random genetic mutation that has existed since at least the Viking age. In areas the Norse conquered, or at least visited in an intimate fashion, that genetic footprint still exists in smaller numbers (2% of people in the Orkney Islands are immune to HIV).
I agree that within ethnicities you can find such variance; but not across race. You cannot look at the population of "Black people" and make the same comparison since that term is simply too broad.
A "Black" person could be descendant of any number of African, whether East African, North African, or sub-Saharan African, and these three distinct groups cover well over 100 genetically distinct ethnicities with sub-Saharan Africans having remarkably different genetic characteristics than East Africans while North Africans having closer genetic composition to certain Southern Europeans than other African ethnic groups.
Simply put, the term "Black" when used in this context, is simply misleading. It does not mean what people think it means, and when they use it to describe or discuss what we call "Black" in this country and try to assign genetic realities to the term it begins to run into a myriad of contradictions, and qualifications, until you reach the point where you realize you can't make any reasonably reliable claims about the genetic traits of "Blacks" even compared to other "Blacks."
Simply put, the term does not apply to a closely related group of people... and that's highly counterintuitive for many folks because they perceive Black people as having a likely singular recent genetic origin.