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When a dog has wild-type alleles at all three genes, it will have a yellow coat. When the dog has a loss-of-function allele at MC1R, it will have a yellow coat regardless of the genes it carries on the other two genes. Only a dominant black allele at CBD103 will produce a black coat color in dogs possessing wild-type alleles at MC1R and Agouti. [8]
Merle is a distinguishing marking of several breeds, particularly the Australian Shepherd and Catahoula Leopard Dog, and appears in others, including the Miniature American Shepherd, the Koolie in Australia, the Shetland Sheepdog, various collie breeds, the Cardigan Welsh Corgi, the Pyrenean Shepherd and the Bergamasco Shepherd. [5]
Dogs have a wide range of coat colors, patterns, textures and lengths. [1] Dog coat color is governed by how genes are passed from dogs to their puppies and how those genes are expressed in each dog. Dogs have about 19,000 genes in their genome [2] but only a handful affect the physical variations in their coats. Most genes come in pairs, one ...
Tricolor can also refer to a dog whose coat is patched, usually two colors (such as black and tan) on a white background. Blue merle tricolor Shetland Sheepdog: Red merle Catahoula Leopard Dogs: Merle: Marbled coat with darker patches and spots of the specified color. Merle is referred to as "Dapple" in Dachshunds. Tuxedo Lab mix. Tuxedo Collie mix
The first possibility is a side effect of the merle gene. Merle dilutes random parts of the paint, including the eyes and nose. This dilution results in a bluish iris, and merle dogs often have blue, walled, or split eyes due to random pigment loss. The higher the dilution of the merle coat, the more likely they are to have blue eyes.
A Stanford University School of Medicine study published in Science in October, 2007 found the genetics that explain coat colors in other mammals such as in horse coats and in cat coats, did not apply to dogs. [1] The project took samples from 38 different breeds to find the gene (a beta defensin gene) responsible for dog coat color. One ...
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The merle coat in dogs is associated with auditory and ophthalmologic disorders, such as deafness and microphthalmia. In Rocky Mountain Horses , the silver dapple color is sometimes associated with Anterior Segment Dysgenesis (ASD) which affects the structures in the face and the front of the eye.