So there you have it. We generally talk about different traits as independent. The Tech Interactive Sometimes a cell makes a mistake when it is copying its DNA or DNA gets damaged from chemicals, radiation, or some other agent. This is not the case. This is actually true of a lot of different traits. Green eyes have some brown pigment that absorbs some of the light and scatters the rest One way that new traits can arise in a population is when there is a DNA change that gets passed to the next generation. Brown eyes have the highest amount of melanin in the iris, and blue eyes have the least. 1-408-294-8324, The Tech Interactive 2019 © All rights reserved. But not every trait is like this. Why do people with blond hair typically have blue eyes? The color of our hair, skin, and eyes is determined by the same thing: the amount of pigment they have. The iris of your eye (the colored part) is where melanin can be found. If your melanocytes produce a lot of melanin, you’re likely to have darker skin, hair, and eyes. Hawks was not involved in the current study. Blue eyes percentage: 50-80. Melanin is made in special cells in the body called melanocytes. If your melanocytes don’t make much melanin you’ll have lighter color skin, hair, and eyes. Why redheads and blondes aren't going to be dying out anytime soon. It may be that this person has a certain version of OCA2 that causes all of these traits. By contrast, only about 16.6% of people in the United States have blue eyes and 16.3% in Spain. No they don’t. Some of these segments, however, that haven't been reshuffled are called haplotypes. One theory for how hair color works They specifically looked at sequences of DNA on the OCA2 gene and the genetic mutation associated with turning down melanin production. There's only brown pigment in the eye — there is no hazel pigment or green pigment or blue pigment. If you’re interested in this part, check out Barry Starr’s answer to a similar question here. Blonde hair, blue eyes, fair skin with no freckles. The blue eyes almost certainly come from a certain version of the OCA2 gene. But they found that blue-eyed individuals only have a small degree of variation in the amount of melanin in their eyes. It changes a C to a T at a certain position and this results in a person having blonde hair. Why redheads and blondes aren't going to be dying out anytime soon. Which means that different blondes trace back their blonde hair to different ancestors. "From this we can conclude that all blue-eyed individuals are linked to the same ancestor," Eiberg said. Eiberg and his colleagues detailed their study in the Jan. 3 online edition of the journal Human Genetics. Yes, it is! Note the “it seems.”  The genetics of hair color is still pretty murky in Europeans so drawing any strong conclusions is still a bit risky. The mutation occurred between 6,000 and 10,000 years ago. People with blue eyes have a single, common ancestor, according to new research. An exception to this appears to blonde people from the Solomon Islands. Blonde hair seems to have appeared more than once in humans. 201 S. Market St. All blondes do not share the same blonde ancestor. Since we are slowly coming to the epicenter top countries that have the most blondes and blue eyes as a … Image from Flickr. The blue color in eyes and water is made by scattering light "Out of 800 persons we have only found one person which didn't fit — but his eye color was blue with a single brown spot," Eiberg told LiveScience, referring to the finding that blue-eyed individuals all had the same sequence of DNA linked with melanin production. But the genes for eye, skin, and hair color are different. And Europeans do not share this genetic difference. 1-408-294-8324, The Tech Interactive 2019 © All rights reserved. Imagine if there was a region where most people had lighter complexions. Jeanna Bryner - Live Science Editor-in-Chief So that’s why you see people with blond hair typically have blue eyes! This blue color is made by light scattering when it hits blue eyes (or the sky or ocean!). The iris of your eye (the colored part) is where melanin can be found.

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