is there some sort of cutoff point where scientists decided “everyone in Ireland 100,000 years ago will be considered 100% Irish”?
In: 12
All DNA is Human DNA, but there are “variants” in the genetic code that happen at random. Some are very minor and don’t produce any visible changes. Some produce some visible changes in the human. When we sequence the DNA from people in different regions, we see that some populations all have some similar variants. We can say these variants are common to that region.
DNA variants happen within humans all the time and if they aren’t immediately deadly variants, they can be passed to children and they’ll pass it to their children, etc. Since people typically breed with people in their region, these variants can become common in that region but are unlikely to be found outside that region.
By the way, these variants are SUPER tiny parts of the entire DNA. It’s like changing the font on one word in one book in an entire library.
So there isn’t any “African” or “European” DNA. It’s all human DNA, its just that if you look closely, you can find the book with the italicized word for Ostrich and then you can reasonably conclude that the library of books came from the same region as the other libraries that have the italicized word for Ostrich in it.
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