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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 ...
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.
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin. These basic features constitute type 2 of the condition; in type 1, there is ...
Albinism is the congenital absence of melanin in an animal or plant resulting in white hair, feathers, scales and skin and reddish pink or blue eyes. [1][2] Individuals with the condition are referred to as albinos. Varied use and interpretation of the terms mean that written reports of albinistic animals can be difficult to verify.
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 ...
In the 2000 US Census, "White" refers to "person having origins in any of the original peoples of Europe, the Middle East, or North Africa." [21] In the 2000 US Census, "Black or African American" refers to a "person having origins in any of the Black racial groups of Africa." [21] The other three self-designated races are not labeled by color ...
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.
Category. v. t. e. The Aryan race is a pseudoscientific historical race concept that emerged in the late-19th century to describe people who descend from the Proto-Indo-Europeans as a racial grouping. [1][2] The terminology derives from the historical usage of Aryan, used by modern Indo-Iranians as an epithet of "noble".