Why do so many Swedish people have blue eyes ?
816894
It may be related to the evolutionary pressure to possess lighter skin in the north. Vitamin D deficiency is unhealthy.
1164536
By Mendelian theory, no. (bb= blue, BB & Bb=brown)\nBlue eyes are a recessive trait \nbb x bb = only bb\nNow if they were Brown eyed with the blue recessive trait and a blue eyed spouse\nBb x bb = Bb Bb bb bb\n\n-----------BUT---------------------\n\nMost of us learned the model for determining eye color that G.C. Davenport and C.B. Davenport devised in 1907. The Davenport model wrongly says brown eye color is always dominant over blue eye color, which means that two blue-eyed parents always have blue-eyed kids. We know better now.\n\n"Although not common, two blue-eyed parents can produce children with brown eyes," says Richard A. Sturm, a Principal Research Fellow at the Institute for Molecular Bioscience at the University of Queensland in Brisbane, Australia.\n\nEye color is a complex trait that depends on the state of several interacting genes. The gene that usually decides the issue (blue eyes or brown eyes) is the OCA2 gene on chromosome 15. But it comes in different strengths. A person with a weak form of the OCA2 gene will have blue eyes. Likewise a person with a strong form will have brown eyes. \n\nThe plot thickens, though, because an individual also has other eye-color genes that each has a say in the final eye-color outcome. For example, if one of these lesser genes is strong, it can make the weak form (blue) of OCA2 work much more effectively — almost like the strong form (brown). Then the eye color may be a light brown or muddy grey. In fact, the resulting color can be any shade of brown, hazel/green, or blue depending on the strengths of the interactions.\n\nSo, yes... two blue eyed parents can produce a brown eyed baby.
375462
generally talking, sweden and norway. but i don't think this can be related to ethnic origin, because there is no 'pure race'. and i also think racial mixing creates more beautiful people.
90923
Somebody in your family must have blue eyes, I got my green eyes from my Dad. As for the genetic reason that's way out of my league. You must have pretty eyes because that was suppose to be one of Elvis's best features.
904553
Not many people have black hair and blue eyes, but the effect is pronounced and quite lovely.\nHaving natural Black hair and blue eyes is commonly a Celtic trait.  If you are of European origin, my guess would be that you have a Celtic background.  My grandfather was Welsh and he had dark hair and bright blue eyes.\nI've also heard of Indian people having similar characteristics.
1039939
Genes don't skip anywhere!\n\nBut eye colour is determined by at least three genes, not just one. So it gets a bit complex. See below.
773156
There have been THREE sets of genes identified which contribute to eye colour.  The reason why green eyes are so rare is that the genes the produce green eyes are themselves rare.\n\nOne set of genes has a brown and blue version, one set has a green and a blue version, and one set controls shading in brown eyes.  The best explanatory theory right now actually suggests that brown is dominant to all other colours (so someone with a mix of genes is probably brown-eyed), green is dominant to blue (so a green-eyed parent and a blue-eyed one will have some green-eyed kids), and blue is completely recessive.  The reason blue is more common than green as an eye colour is that there are just so few green-eyed genes in the population.\n\nIt bears mention that this theory fails to explain many oddities of eye colour, so there are probably several other genes that are involved but haven't been located yet.  (That's what makes biology exciting, if you ask me!)\n\nNor is there any reason to believe that green eyes are going to 'disappear' from future generations.  Unless some kind of selective force acts on genes, they are just as frequent in each generation, though they may become more spread out.  So if 1% of the population has a green-eyed gene in one generation, the same percent is likely to have it in every following generation, barring some kind of accident, selective pressure, or the like.
1158572
yeah, in like 500-1000 years like everyone is going to become the same skin color because of the race mixing going on until then.  we will be all the same color and we wont really know who is german, swedish,  or african for sure.  maybe they will be racist against people with i.e. blue eyes, or black hair. but not because skin color or ancestry
40716
I disagree with the one said blue eyes are dominant. Actually the gene of blue eyes is resessive. So if either one parents or grandparents have the gene of brown eyes, their offspring can more chances to get brown eyes than blue. Of couse, blue or brown eyes really depends on the genotype of the parents, not the phynotype. So if and only if both parents have blue eyes, they offspring have 100% chances to get pure blue eyes gene. \n\nSO if your eye color is brown, and your children are blue, that means that you have a blue eye gene, but because it is recessive, thus the phynotype of your eye color is brown. Your children would have 1/2 chance to get either blue or brown eye color in this situation.\n\nThe following link talks about the eye color in detail.
745396
Hi there, i don't know how old are you so can't decide on how technical i can be in answering this question. Any way i shall try to be simple.\nThe coloured (black, blue, green or whatever) part of the eye is called the IRIS (not pupil).  It is a shutter that guards the tiny hole in its center(this hole is actually called pupil). \nThe iris prevents too much of light from entering the eyes.It also helps animals and man to see better in darkness. The blackish pigment that colours your iris is MELANIN and its the same colouring agent that gives tan to your skin. Some people have deep melanin pigmentation on their iris and hence they have blackish iris. in some people, the amount of this pigment is a bit low, hence, their eyes seem brown. When the amount of colour is much lower, the eyes appear more bluish yellowish or greenish.\nIts actually the total absence of melanin that makes some eyes look blue or green. \nok, then thats all....\nGood bye!
1146193
My parents and all my family are from Ireland. We all have blue eyes. People there tend to have brown hair and blue eyes. The women are usually quite distinguishable, but the men vary. \nSome of my cousins are blond. Obviously there is diversity, but there is also the norm.
768920
I have never met all the Koreans in the world so I can't come to those conclusions just based on my own experiences. People are individuals not colors..
106888
okay.. this is probably from hearsay.. \nCoz all I know is that.. I myself (not coz am from India or anything) out of my personal experiences am a little beware of cat eyes (people with light coloured eyes)\n\nAnd now.. more specific to your answer..\n\n.. think it is to do with (wrongly?) proclaiming xyz person as being witch or practicing witchcraft and thus having bad intentions/ aka an evil eye..\n\nMore copy/ paste from Aunt Wiki follows..\n\n"..The evil eye is a widely distributed element of folklore or superstition: a belief that some people, often women seen as witches, can bestow a curse on victims by the malevolent gaze of their magical eye. The effects on victims vary; some have them afflicted with bad luck of various sorts. Others believe the evil eye has even more baleful powers, that it can cause disease, wasting away, and even death.."\n\n"..Belief in the evil eye is strongest in the Middle East, Asia and Europe, especially the Mediterranean region; it has also spread to other areas like the Americas. In some areas where light-colored eyes are relatively rare, people with blue eyes are feared to possess the power to bestow the curse, intentionally or unintentionally.."\n\nhttp://en.wikipedia.org/wiki/Evil_eye
474523
There are some great maps out there correlating skin tone with a modeled optimum at each geographic point.  That optimum is based on balancing the need to avoid burning and skin cancer against the need to obtain UV light for creation of vitamin D.  \n\nOther adaptations relate to features of the environment.  Northern Europeans, Inuit, and Eskimo people have a distribution of fat on their bodies that is optimized for heat retention.  The body shape of a Masai, for example, would be less than optimal near the North Pole.\n\nThere is a hypothesis that many traits are associated with sexual selection or may pertain to the tradeoff between sexual selection and aspects of the environment.  The distribution of fat tissue, particularly in women, in different races has been proposed as correlated with cultural differences in male preference as well as with adaptaion to the local environment.\n\nFinally, there is the feature of accident.  The epicanthal fold of many East Asians might have been beneficial to many Caucasians, but perhaps by chance the feature simply wasn't present in founding populations in Europe.  Characteristics in founding population and gained or lost by chance certainly play a big role in differences in humans from different geographic areas.  Not everythig is adaptive.\n\nBear in mind that this is not based on fixed differences among populations or races of humans, but instead on gene frequency in different populations.  For example, Swedes are lighter in skin color than the Ndebele not because each population has distinct genes, but because those genes differ in frequency.  Among all the loci that contribute to skin color, Swedish populations have very few alleles that code for dark skin.  Each individual Swede will therefore have only a few dark loci where dark alleles are present whereas most loci will have light alleles.  The Ndebele populations and individuals would act in reverse.
702252
I think its 3 to one since blue is a recessive trait compaired to brown or any other darker eye color since eye color is a mix of pigment and pattern.
520332
It's a question of genetics. Different genes will lead to different quantities of various substances produced and present in some part of your body. Eye color is mainly determined by the pigment melanin (the same that gives you a tan when you lie in the sun). \n\nIf your eyes have a lot of it, they're brown. If they don't, they're blue. Green eyes result from yellowish flecks of a fatty pigment against a dark background, and no melanin.\n\nThere you go :-)
838431
This is a genetic matter\nIt depends to you mother and father's eye chromosomes\nAt first humans they used to have brown eyes.\nWith mutations in chromosomes, colors like \nblue, green, black, hazel were developed.