Today’s topic is What Does Black And Brown Eyes Make. Obviously, you can find a great deal of Hazel Eyes-related content online. The proliferation of online platforms has streamlined our access to information.
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7 Things You Should Know About What Does Black And Brown Eyes Make | What Is the Rarest Eye Color in the World?
- Brown eyes are the most common: Over half the people in the world have them, according to the AAO. In fact, about 10,000 years ago, all humans had brown eyes. Scientists speculate that their elevated levels of melanin helped protect people from the sun’s damaging rays. But as people moved from the sweltering climates of Africa and Asia to the cooler environments of Europe, there was less need for this protection. - Source: Internet
- As a side note, while there is a wide variability in eye color, colors other than brown only exist among individuals of European descent. African and Asian populations are typically brown-eyed. In 2008 a team of researchers studying the OCA2 gene published results demonstrating that the allele associated with blue eyes occurred only within the last 6,000 – 10,000 years within the European population. - Source: Internet
- At some point in history, as humans migrated north, a gene mutation occurred to reduce melanin production, says Kaplan. When the eyes have less melanin, they absorb less light. That means more light is scattered out from the iris, or colored part of the eye, which reflects off the surroundings. Eyes with the smallest amount of melanin in them will appear blue, while those with a little more melanin will appear green or hazel. - Source: Internet
- In humans, eye color is determined by the amount of light that reflects off the iris, a muscular structure that controls how much light enters the eye. The range in eye color, from blue to hazel to brown (see figure one), depends on the level of melanin pigment stored in the melanosome “packets” in the melanocytes of the iris. Blue eyes contain minimal amounts of pigment within a small number of melanosomes. Irises from green–hazel eyes show moderate pigment levels and melanosome number, while brown eyes are the result of high melanin levels stored across many melanosomes (see figure two, left). - Source: Internet
- One gene, OCA2, controls nearly three-fourths of the blue-brown color spectrum. However, other genes can override the OCA2 instruction, albeit rarely. This multifactorial model for eye color explains most of the genetic factors that influence eye color. - Source: Internet
- In 1907, Charles and Gertrude Davenport developed a model for the genetics of eye color. They suggested that brown eye color is always dominant over blue eye color. This would mean that two blue-eyed parents would always produce blue-eyed children, never ones with brown eyes. - Source: Internet
- The color of human eyes, skin and hair is primarily controlled by the amount and type of a pigment called melanin. Specialized cells known as melanocytes produce the melanin, storing it in intracellular compartments known as melanosomes. The overall number of melanocytes is roughly equivalent for all people, however the level of melanin inside each melanosome and the number of melanosomes inside a melanocyte varies. The total amount of melanin is what determines the range of hair, eye and skin colors. - Source: Internet
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