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Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [ 1 ][ 2 ] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [ 3 ]: 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 September 2024. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Melungeon (/ m ə ˈ l ʌ n dʒ ən / mə-LUN-jən) (sometimes also spelled Malungean, Melangean, Melungean, Melungin [3]) was a slur [4] historically applied to individuals and families of mixed-race ancestry with roots in colonial Virginia, Tennessee, and North Carolina primarily descended from free people of color and white settlers.
Auburn hair. Auburn hair is a human hair color, a variety of red hair, most commonly described as reddish - brown in color. Auburn hair ranges in shades from medium to dark. It can be found with a wide array of skin tones and eye colors. The chemical pigments that cause the coloration of auburn hair are frequently pheomelanin with high levels ...
In the 1730s, Carl Linnaeus in his introduction of systematic taxonomy recognized four main human subspecies, termed Americanus (Americans), Europaeus (Europeans), Asiaticus (Asians) and Afer (Africans). The physical appearance of each type is briefly described, including colour adjectives referring to skin and hair colour: rufus "red" and ...
Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism ...
Specialty. Dermatology. Albinism is a congenital condition characterized in humans by the partial or complete absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.
This amount varies strongly between individuals. People with blue eyes have relatively low melanin in the fundus and thus show a much stronger red-eye effect than people with brown eyes. Red-eye effect on dark brown eyes. The same holds for animals. The color of the iris itself is of virtually no importance for the red-eye effect. This is ...