Why did all these different hair colors form in Europe? Typically as being of European descent I pay attention to hair color, eye color, and eyebrows? What do Chinese, Japanese, and Koreans pay attention to in a face? I hear they most pay attention to nose length and hairline. But what is hairline? I have heard Asians think that all Europeans have long noses and big eyes which I don't think. And what are homogeneous genes?
Why is black hair and black eyes nearly 100% in China, Korea, and Japan?
Currently it is because black hair and dark brown eyes are dominant genes, so even if they have kids with someone with blue eyes and blonde hair, the kids will still come out with black hair and dark brown eyes because everything else is recessive genes.
In order to get a baby with Asian ancestry to have blue eyes and blonde hair you would need both parents to be half caucasian, both having the gene for blue eyes and blonde hair, and both passing those genes onto the child. The odds of all that happening are very low, less than 5%. The most likely outcome would be a child with dark hair and dark eyes carrying the genes for blue eyes and blonde hair.
As for where colored hair and eyes came from in the first place, those were mutations that came about in Northern Europe, and probably were allowed to propagate because of the weaker sunlight of the northern lattitudes (the lighter skinned people with blue eyes and blonde hair didn't have to worry about skin cancer in Finland, whereas they would not have lasted in Africa). And even though they could have survived in asia, either there weren't enough of them, and they were bred out of existence (they mated with asians with dark features) or those genetics just never popped up - and in fact there are records from the 7th century in China of a large population of caucasians, that eventually disapeared, probably absorbed into the gene pool. Basically, it is because of genetics. Caucasions are literally a bundle of recessive genes - nearly all non-white genes are dominant.
As for what they 'pay attention to', probably the whole picture, just like anyone else. But they can't describe the differences as easily, since in a general sense, everyone 'looks the same'.
Why is black hair and black eyes nearly 100% in China, Korea, and Japan?
That's too many questions!
Well my guess is that the Asian cultures don't like their kids to marry anyone from another country, so their looks pretty much stay the same.
I don't know why they pay attention to facial features (maybe because for signs of luck or something) but the hairline is the 'line' on top of your head, usually down the middle, where your hair grows from.
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