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Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism, chimerism, disease, or injury. [2] It occurs in humans and certain breeds of domesticated animals. Heterochromia of the eye is called heterochromia iridum or heterochromia iridis. It can be ...
Woman with Waardenburg syndrome type 2, showing heterochromia and white forelock. The difference that defines type 2 from type 1 is that patients do not have the wider gap between the inner corners of the eyes (telecanthus/dystopia canthorum). Sensorineural hearing loss tends to be more common and more severe in this type.
A rare predominantly black cat with odd eyes. The odd-eyed colouring is caused when either the epistatic (recessive) white gene or dominant white (which masks any other colour genes and turns a cat completely solid white) [3] or the white spotting gene (which is the gene responsible for bicolour coats) [4] prevents melanin granules from reaching one eye during development, resulting in a cat ...
It results in common Waardenburg syndrome symptoms such as abnormal hair and skin pigmentation and heterochromia, but also present with symptoms of Hirschsprung's disease. [citation needed] Symptoms include abdominal pain and bowel obstruction. Waardenburg syndrome type 4A is the rarest among the types, appearing only once in about every ...
The genetics and inheritance of eye color in humans is complicated. As of 2010 , as many ... Heterochromia (heterochromia iridum or heterochromia iridis) ...
Waardenburg syndrome type 1; White forelock hair is shown here. When the Waardenburg syndrome type 1 first was studied, this feature along with the dystopia canthorum was the main focus of the research and identifying factor for patients.
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Her research focused on the inheritance of eye color in rabbits and humans. [8] Her particular interest was the Heterochromic iris that she had examined since 1938. Magnussen used the scientific method to lead her to the conclusion that the eye is not only genetically, but also hormonally, determined.