system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do white people have more variety in eye and hair color than other races?

It's a fact that race is not a biological concept. It is a social construct and the idea that any race is "pure" is nonsense. But how come it's mostly whites (specifically people of European and to a lesser extent, people of Middle Eastern, North African, and South Asian descent) who have a much greater variety when it comes to physical traits? Eye color ranges from light blue to dark brown. Africans, Native Americans, and East Asians usually only have black hair. Hair color also ranges from light blonde (in some cases, almost white) to black. In other races, it's black hair that usually predominates. White people also have very straight hair to very curly hair. And lastly, when it comes to skin color, white people are also have a much broader range (think of Scandinavians compared to Greeks and Sicilians).

But what makes no sense to me is that I learned in my human biology class is that Africans have the most diverse gene pool. But then when it comes to physical traits, it sure looks like white people are the most "mixed race". I'm confused.

I'm curious about this because my family on both sides is Indian (specifically from Gujarat, which borders Pakistan). Even though we're all from the same area in the world, I have relatives whose skin ranges from light as some Europeans to very dark. A bunch of people, including my sister, have green eyes. Most people have black hair but some have dark brown. Same thing goes for straight hair vs. curly hair.
gpt
Actually you could argue that the race divisions are so arbitrary that what could be considered races never were. For example, people who live in china do have noticeably different face shapes (in general) than Japanese people. Nepalese people looks sort of between Tibetans and Indians. Mongolians look a bit like Inuit but a bit like Chinese people. Nordic people specifically could be considered a race, but further than that, the Danes (commonly blond, blue eyed, and very tall) could be a race. Slavic people could be considered one and Semitic and Mediterranean people are often thought of as being so. Lebonese people are a bit more mediterranean looking than people who live in Afghanistan, and the farther north and east you go in africa, the more people look like Egyptians. Black people could even be further divided than they are. The Massai tribe (tall gangly running hunters) are very very different from the Kalahari bushmen (short with pot bellies), and you can't tell me the first time you saw an ethiopian man you weren't like....okay wow, that guy is actually BLACK.