it was assumed that being European and being white go hand and hand
Because it does, you fucking marxist propagandist cunt. All dark skinned Europeans died out following the adaptation of agriculture throughout Europe.
Some genetic changes may have helped to compensate for shortages in the new diet. For example, we see changes in genes affecting transport of vitamins into cells.9 Similarly, vitamin D shortages in the new diet may have driven the evolution of light skin in Europe and northern Asia. Vitamin D is produced by ultraviolet radiation from the sun acting on our skin—an odd, plantlike way of going about things. Less is therefore produced in areas far from the equator, where UV flux is low. Since there is plenty of vitamin D in fresh meat, hunter-gatherers in Europe may not have suffered from vitamin D shortages and thus may have been able to get by with fairly dark skin. In fact, this must have been the case, since several of the major mutations causing light skin color appear to have originated after the birth of agriculture. Vitamin D was not abundant in the new cereal-based diet, and any resulting shortages would have been serious, since they could lead to bone malformations (rickets), decreased resistance to infectious diseases, and even cancer. This may be why natural selection favored mutations causing light skin, which allowed for adequate vitamin D synthesis in regions with little ultraviolet radiation.
Above from "The 10,000 Year Explosion" by Gregory Cochran and Henry Harpending.
someone like me who was born here in the UK, whose parents were British citizens, whose grandparents were British subjects
So she's a second generation Indian. Her grandparents were British subjects because the British colonized their lands.
so you look at someone and say you're dark skinned but you're living in Britain therefore either you or one of your recent ancestors must have came somewhere where there is dark skin. But when you think about how many genes there are and how widely distributed they are across your genome, and the many ways and variations in which they can come together from your parents and your grandparents, etc, it's actually a very bad proxy
If physical appearance isn't a good marker for ethnicity why is she's clearly an Indian or Pakistani, rather than a native Brit? She said that she's been seen as a foreigner all of her life, so why is it that the case? Shouldn't she occasionally be confused for a native Brit?
it does make me feel more comfortable as a brown Briton
Why? She doesn't have an connection to Cheddar Man, whereas a percentage of native Brits do.
And it should be noted that the image of "Cheddar Man" being shown in British media is just an artistic interpretation of what a dark skinned European would have looked like 7000 years ago. Here's another, pic related. More on Cheddar Man:
The first Britons were black, Natural History Museum DNA study reveals
Paragraph from the article:
“The combination of quite dark skin and blue eyes is something that we don’t imagine is typical, but that was the real appearance of these people, something that’s quite rare today,” said Professor Chris Stringer, research leader in human origins at the Natural History Museum.
So what is it, "black" skin or "quite dark"? What does "quite dark" mean? Just significantly darker than modern Europeans?
For another estimation on what dark skinned European hunter gatherers probably looked like see pic related:
Hunter-gatherer European had blue eyes and dark skin
And even if Cheddar Man had "black" skin that does not mean he was Sub Saharan African. Race isn't just skin color.