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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 in ...
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.
The Caucasian race (also Caucasoid, [a] Europid, or Europoid) [2] is an obsolete racial classification of humans based on a now-disproven theory of biological race. [3] [4] [5] The Caucasian race was historically regarded as a biological taxon which, depending on which of the historical race classifications was being used, usually included ancient and modern populations from all or parts of ...
Many babies are born with blue eyes, and then their eyes change color as their genes continue to develop. Hair color is the same way, sometimes, babies are born with very light colored hair that ...
The race and appearance of Jesus, widely accepted by researchers to be a Judean from Galilee, [ 1] has been a topic of discussion since the days of early Christianity. Various theories about the race of Jesus have been proposed and debated. [ 2][ 3] By the Middle Ages, a number of documents, generally of unknown or questionable origin, had been ...
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 ...
Ancient Egyptian race controversy. The Ancient Egyptian classification of ancient peoples (from left to right): a Libyan, a Nubian, an Asiatic, and an Egyptian. Drawing by an unknown artist after a mural of the tomb of Seti I; Copy by Heinrich Menu von Minutoli (1820). In terms of skin colour, the Libyan has the lightest complexion, followed by ...
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.