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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 ...
Most Brittanys are born with long tails, subsequently docked to a length of 3–10 centimetres (1.2–3.9 in), however sometimes they are born with short tails. [ 2 ] The breed's coat color is varied: an orange and white coat or liver and white are most common in the American Brittany; other colors include orange roan and liver roan, all of ...
Color blindness or color vision deficiency ( CVD) is the decreased ability to see color or differences in color. [ 2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...
Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.
Dog coat genetics. 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.
Despite their duller eyesight, dogs can be visually attracted to the content playing on a television screen. While we have three types of color-processing retinas in our eyes, dogs only have two ...
Specialty. Ophthalmology. Dichromacy (from Greek di, meaning "two" and chromo, meaning "color") is the state of having two types of functioning photoreceptors, called cone cells, in the eyes. Organisms with dichromacy are called dichromats. Dichromats require only two primary colors to be able to represent their visible gamut.
The Old English Sheepdog is a large dog, immediately recognizable by its long, thick, shaggy grey and white coat, with fur covering their face and eyes. The ears lie flat to the head. Historically, the breed's tail was commonly docked (resulting in a panda bear –like rear end), but tailed Old English sheepdogs are now common, as many ...