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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.
Two copies on a chestnut horse produce a pale, uniform apricot color of body hair, mane and tail as well as pale skin. It also interacts with Cream dilution to produce "pseudo-double" Cream dilutes with pale skin and blue or green eyes. Silver Dapple Gene lightens black hair, such as the mane and tail of a bay horse
However, cats can also have double-layered coats out of two hair types in which the down hairs form the soft, insulating undercoat, and the guard hairs form the protective outer coat. [40] A typical cat coat exists of all three natural hair types, but due to the equal lengths of two of these hairs, the coat is still considered double-layered. [40]
Roan is a coat color found in many animals, including horses, cattle, antelope, cats and dogs. It is defined generally as an even mixture of white and pigmented hairs that do not "gray out" or fade as the animal ages. [1] There are a variety of genetic conditions which produce the colors described as "roan" in various species. Bay Roan with ...
The alleles at the K locus (the β-Defensin 103 gene or DEFB103) determine the coloring pattern of an animal's coat. [34] There are three known alleles that occur at the K locus: K B = Dominant black (black) k br = Brindle (black stripes added to tan areas) k y = Phaeomelanin permitted (pattern expressed as per alleles present at A and E loci)
A gray horse (or grey horse) has a coat color characterized by progressive depigmentation of the colored hairs of the coat. Most gray horses have black skin and dark eyes; unlike some equine dilution genes and some other genes that lead to depigmentation, gray does not affect skin or eye color. [1]
However, the pervasive coat color among wild equids is dun, and researchers from Darwin to modern day consider dun to be the wildtype state. [29] [30] An older non-dun mutation was found in 2015 and named non-dun 1. It creates primitive markings but does not dilute the base color, and is co-dominant with the more common non-dun 2 but recessive ...
True white horses have unpigmented skin and hair due to the incomplete migration of melanocytes from the neural crest during development. [8] No health defects are associated with the cream gene. This is also true of the normal variations in skin, hair and eye color encoded on the human SLC45A2 gene. [9]