in human beings brown eyes are dominant?
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Eye Color. In general, dark or brown eye color is dominant over light color. Eye color is actually the result of multiple genes, but we can simplify the process and use just one gene for eye color, with brown being the dominant color and blue being the recessive color.
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This is why brown eyes are more common than blue eyes— brown eyes are a dominant gene. Every person will inherit genes from their parents that affect the shape, size, and prominence of their ears. It is not uncommon to see large, protruding ears passed down from parent to child.
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Luckily, the gene that determines long lashes is dominant, while short lashes are a recessive trait.
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Since brown eyes are dominant, the mom can have either one brown (B) and one blue (b) version of an eye color gene or she can have two browns. As geneticists like to say, she can be either Bb or BB. To make things easier, we will say that she is BB (both genes are the brown version).
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Although having brown eyes is a beautiful thing, there are a few disadvantages that come with having this dark phenotype. For example, according to an article published in The Journal of Pain, women with brown eyes are more sensitive to pain than their light-eyed (green, blue, gray) counterparts.
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A dominant allele is always expressed, even if one copy is present. ... You only need one copy of this allele to have brown eyes. Two copies will still give you brown eyes. A recessive allele is only expressed if the individual has two copies and does not have the dominant allele of that gene.
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The allele for brown eyes is the most dominant allele and is always dominant over the other two alleles and the allele for green eyes is always dominant over the allele for blue eyes, which is always recessive.
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Brown-haired people have medium-thick strands of hair. Brown-haired people are thought to produce more skin-protecting eumelanin and are associated with having a more even skin tone. The range of skin colors associated with brown hair is vast, ranging from the palest of skin tones to a dark olive complexion.
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Your eye color is largely determined by genetics. Green eyes are the rarest color. Brown eyes are the most common. People can also have blue eyes, (Learn More) gray eyes, (Learn More) or hazel eyes.
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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.
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Brown Eyes Brown is the most common eye color (though that makes them no less awesome). People who don this hue are said to be very independent, self-confident and determined. You are trustworthy, and offer sense of security and stability to anyone in your periphery.
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Both the amount and type of melanin produced is controlled by a number of genes that operate under incomplete dominance. One copy of each of the various genes is inherited from each parent. Each gene can come in several alleles, resulting in the great variety of human skin tones.
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Both brown hair and blue eyes are very common among white people so the brown hair/blue eyes combination is NOT rare. It's actually very common.
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The way people write out dominant and recessive traits is the dominant one gets a capital letter and the recessive one a lower case letter. So for eye color, brown is B and blue is b. As I said above, people have two versions of each gene so you can be BB, Bb, or bb--BB and Bb have brown eyes, bb, blue eyes.
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Men with brown eyes were rated consistently as more dominant than blue-eyed men. No such effect of eye-colour was found for the photos of women. Eye colour also bore no association to the attractiveness ratings. Next the researchers used Photoshop to give the brown-eyed men blue eyes and the blue-eyed men brown eyes.
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While all hazel eyes will have a combination of green and brown colors, the difference in dominant colors is why hazel eyes can appear either mostly green or mostly brown.
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The different colored eyes are determined by the concentration and distribution of melanin (which is a natural pigment that gives us our skin, hair and eye colors). This is a hereditary condition. While it is rarer to see Huskies with this type of eye color (rather than two eyes of the same color), it is still normal.