I have fortunately found some clarity in the midst of confusion on the subject of ethnicity/race, and understand it is not a social construct.
What I can not still wrap my head around however is "purity". How can there be ethnic/racial groups such as "european", "american", "african", "indian", "canadian", "japanese", "chinese", "korean", etc, etc, when throughout human history, people of various ethnicities/races have been mixing genes alongside each other, which means there isn't one single "european", "american", "african", "indian", "canadian", "japanese", "chinese", "korean", etc, etc, ethnicity/race and everyone is a mixture of multiple ethnicities? Most people that are of one of these ethnicities, always turns out are some percentages of other ethnicities too during the DNA testings. For instance, "I'm actually [insert number]% japanese!", a chinese might find out. How can they be only chinese ethnically when they have percentages of other ethnicities in their genes?
Or for instance, an american might find out they are "[insert number]% irish, and [insert number]% african". How can they be only ethnically american when they have percentages of other ethnicities in their genes?
Every "non-african" ethnicity shares genes with africans too, because every "non-african" population descends from africans. Isn't every ethnicity partly african and therefore a mixture of more than one ethnicity then? Which means there is no such a thing as a "non-african" ethnicity/race?
What brings up these questions is this particular answer on Quora, written by a phd molecular biologist that claims ethnicity/race is fluid, and can not be defined because all genes are mixed and environments constantly change: https://imgur.com/tXGzMJU
All “races" are minor adaptations to local environments and also the product of a genetic phenenmonen called Founder Effect. Southern Africans have the most molecular commonality with all other “races" and that is one of the main molecular based reasons why we say we can trace our lineage back to Africa.
Finally our environments are constantly changing as our microevolution to adapt to that change. Thus there is no fixed race, instead it is fluid and undefined.
And further this article that claims no ethnicity/race can be pure (in other words, that every ethnicity/race is fluid), because of these genetic mixings: https://news.harvard.edu/gazette/story/2019/02/harvard-geneticist-no-populations-dna-is-pure/
If every single ethnic group is a mix of other ethnic groups, how can they be considered only one ethnic group instead of a mixture? And if everyone is a mixture, how does it make sense to claim someone is mixed now (e.g. "half-white, half black")? Would it make no sense as everyone is essentially a mix?
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