Probably because of the climate. Black Africans, Dravidians and Australian Aborigines live in very warm climate (either humid tropical or dry desert climate) - that's why they have darker skin, curly hair, wider nostrils etc. For the same reason (climate adaptation) - they have mostly black hair and brown eyes.
East Asians, and other Mongoloids (e. g Polynesians, Native Americans, Eskimos etc) live in more diverse climate, from warmer and moisty subtropical and monsoon climate, to cold and dry subarctic climate, but they all live in areas with lots of winds, that's why they have "eye fold" (slanted eyes), because it protects the eye from the windy conditions - sand, dust and other particles carried by strong wind currents. Their skin is a bit darker than European, but not as dark as African or Aboriginal, because they don't live in too warm environment. That's why they have mostly black or in some cases brown hair, and mostly brown or sometimes hazel eyes.
Whites (Europeans and other Caucasians) have mostly lighter skin, eyes and hair because they mostly live in colder climate, however, some Caucasians are darker, for example indigenous Semites (Arabs, Hebrews, Arameans etc), Hamites (Egyptian Copts, Berbers, Tuaregs etc) and Indo-Aryans (Indians, Persians, Sinhalese etc) - because they actually live in warmer climate... but they are not as dark as the Africans or Aborigines, cause of the milder climate.
Dark Caucasians also have darker hair and eyes in most of the cases, but the "Whites" you are referring to are mostly Europeans (Slavic, Germanic, Celtic, Baltic etc). Blonde, red and orange hair, as well as blue, green and gray eyes are all just a product of mutation, due to longer exposure to colder climate.
That's my theory but I'm not an expert in genetics :P
Asian and African peoples were subject to stricter homogeneity throughout human evolution while the races that would become white underwent several separate evolutionary adaptations from each other as human migration saw them spread to radically different climates. Lighter eye colors started developing along with lighter skin colors, and these different colors were mixed in with each other as well. Darker hair and skin are more dominant genetically, so with the homogeneity of these dominant genes in certain regions, they were subject to very little adaptation. The necessity and opportunity were both absent, so things didn't really change, and that carries down to today because of dominant genes.
So there are more countries who's people are considered white. Almost the entire continent of Europe, Russia, Middle eastern people, Australia, Britain, etc. And since all those countries / continent are in diffrence regions of the world all their people look diffrent, because they have evolved to Live in their region. Also people with less melatonin in their skin are more likely to have less melatonin in their eyes and hair. Also Brown hair and brown eyes are the most common and original colors and the others are mutants. Whites also probably have the most mixed babies, like Europeans came to America and many had children with native Americans, who tend to have dark hair, skin and eyes. But the biggest reason is probably because of all the areas of the world that the people are considered white. Southern European countries tend to have people with darker features than northern European countries, middle eastern people also tend to have darker features (light eyes seem to pop up there sometimes). So it's all because countries that are considered white are all over the world and live in diffrent environments. Blacks (which are not all from Africa) tend to be from africa, Jamaica and places like that. Asians are all from well asia, pacific islanders are all from pacific islands, Hispanics are mainly from central and south America and Spain. So whites are from all over while everyone else tend to be from close/ similar regions to eachother
Some theorize and believe that it is a side effect of natural selection for fairer skin to ensure enough vitamin D at northern latitudes. However, from what I know, color is weakly influenced by the different alleles for hair color or eye color apart from the ones for red hair or blue eyes. Some have no effect at all on skin pigmentation.
Perhaps there was some sort of intermixture gene flow between neanderthals and early Europeans... not enough to account for the large number of Europeans with neither black hair nor brown eyes... it's been a wonder to me as well that professors and TAs I have asked can't really pin an answer but only an opinion.
Good question!
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Because blue eyes are a recessive allele. Brown is dominant and green is a combination of both Blue and brown. Bb could express as brown or green.
Whiteness was kind of a genetic mutation that popped up when humans immigrated to Europe. White people have more recessive genes and higher chance for diversity and this includes eye color.
If you want to know more I would hit the library and look for a biology book. Most internet articles I found just complained about racism rather than give me a solid concrete answer.
There are about 16 different genes that determine 90% of eye colors but two are of special importance since they more or less determines the difference between brown eyes and blue eyes. All other colors are basically derived from this original split so the place where blue eyes originated from will as a result have a lot more variety.
It is very similar with hair color where the difference between dark and blond can also result in showing red/orange pigmentation so the location where blond hair originated also has a lot more variety.
Since both blue eyes and blond hair evolved recently in Europe/nearby this diversity has not spread to other locations in the world quite yet but it will happen in due time.
Blue eyes and blond hair are recessive alleles. Considering there has always been immigration towards Europe, it makes sense that dominant alleles, such as darker skin, black hair, brown eyes, got thrown in the mix which results in more diversity in hair colour.
Black hair is a dominant allele, meaning the offspring will pretty much always have brown hair. If one of the parents carries the allele for blonde hair, the offspring will still have brown hair.
It's got to do with the recessive and dominant alleles, which eventually determine the main physical traits of the offspring.
Our hair and eye colours are genetic mutations, this is how biology works over time. On occasions, you will see the same mutation in Asiens and Africans, however, since they don't multiply with over having the same mutation they don't create a new race.
When the first Europeans came to Europe they carried these mutations in a fair percentage of the population, enough so this became normal over time. European have only been white and our current features for about 5000 years, in the stone age our ancestors where dark as well. We can see this in findings here in Scandinavia.
Being white itself is a recessive trait of genes. So is blue eyes and blond hair.
A person with all dominant genes will be a negroid with the darkest skin colour and black hair and dark brown eyes. Similarly a person with all recessive would be a an albino with blond hair and blue eyes.
And most people are heterozygous dominant. That's why there is a lot of "vivid" diversify in whites than in negroids or mulattos.
That's a really fascinating question and I'm sure it has everything to do with genetics. What will be a real shame for the human race is if that great diversity disappears, because many of those phenotypes are the result of recessive genes (if I remember my biology correctly).
There is Evo speculation that since in colder climates people usually covered more of their body, we got selection pressure towards interesting features. Blonde hair even gives an illusion of youth, hence why blonde hair is more favorable on women. All of this is speculation though.
It's how melanin shows in the skin... protein concentration and light absorption. Certain colors dominate others and blacks have more dominant colors because of their increased melanin
Well it really doesn’t matter. They wear different color weaves and they wear different color contacts.
Because white people have the more diversity in their genes.
It's mostly genetics also iv seen many black people with light brown to Hazel.
It’s genetics. White peoples have less dominant genes to where the recessive ones like blue eyes, green eyes, blonde hair, and red hair have the possibility of being shown.
Because whites descend from mongrels from different origins.
So much for white supremacists...
Evolution made it that way , and some things in skin can influence genes
Any species that has that type of extreme diversity in an area, has at one point encountered human enforced selection over time. Sorta like the holocaust, but unrecorded.
Because they have recessive alleles... East-Asians and Africans have very dominant alleles.
Well, I'm curious to know too. Maybe, whites have mutations lol.
Because Europe has been a melting pot for generations.
Colored eyes and to some degree different hair colors occurred from genetic mutation.
It's just good luck..
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