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The full genetic basis of hair color is complex and not fully understood. [1] Regulatory DNA is believed to be closely involved in pigmentation in humans in general, [2] and a 2011 study by Branicki et al. identified 13 DNA variations across 11 different genes that could be used to predict hair color.
The Fischer–Saller Scale, named for eugenicist Eugen Fischer and German anthropologist Karl Saller , is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: [1] [2] [3] [4]
Melanin is the protein that creates skin, eye and hair color. More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3.
Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
An agouti dog, also called wolf sable. In dogs, the agouti gene is associated with various coat colors and patterns. [10]The alleles at the A locus are related to the production of agouti-signaling protein (ASIP) and determine whether an animal expresses an agouti appearance and, by controlling the distribution of pigment in individual hairs, what type of agouti.
Prepubertal hypertrichosis is characterized by an excess of hair growth, seen during birth and progressing during childhood. [3] [6] In generalized hypertrichosis, excessive hair growth occurs all over the body, whereas in localized hypertrichosis, excessive hair growth only occurs in certain areas of the body. [2]
Horses with a gray gene can be born any color and their hair coat will lighten and change with age. Most wild equids are dun, as were many horses and asses before domestication of the horse . Some were non-dun with primitive markings , and non-dun 1 is one of the oldest coat color mutations, and has been found in remains from 42,700 years ago ...
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