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Asians tend to be more standardize in terms of their physical features. they are all very similiar to one another somehow. For example, All Yellow Skin nations & races have black hair, yellow skin, & black eyes. People of the Middle East in Asia are also very similiar to one another in terms of their physical features as well. But however for the Caucasians, it is a little more complicated. some have blond hair, some have blue eyes , some have green eyes. the only similiarity is that they are all white!If all human race orginated from Africa, & All Yellow people orginated from China, then where did all the white people orginated from?
Based on my (limited) knowledge of genetic history, mankind came out of Africa with dark skin. A section or sections that migrated north and west into Europe, especially northern Europe, had no need for dark skin because their weaker sunlight posed less of a danger to them. As generations passed, the dark skin of these groups in northern Europe eventually faded and they became white. I'm guessing something similar happened with eye color; I hear that blue-eyed people have eyes that are more sensitive to sunlight, which means that people closer to the equator would tend to have darker eyes. I am not sure what accounts for the division of races (e.g. Asian from Caucazoid or Negroid).
All human beings adapt to the lanscape, food sources and interbreeding or lack thereof, with other humans. An interesting aside, scientists belive that red hair is on the way out, unless both parents carry a gene for red hair (it can be ressecive) their offspring will not posses it. For some reason fewer redheads are breeding with other redheads, limiting the possible offspring with the trait. Recent DNA studies on 40,000 year old Neanderthal remains have demonstrated that they possesed the red hair/ blue eye trait.
