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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, chimerism, disease, or ...
Occasionally, heterochromia can be a sign of a serious medical condition. A common cause in females with heterochromia is X-inactivation, which can result in a number of heterochromatic traits, such as calico cats. Trauma and certain medications, such as some prostaglandin analogues, can also cause increased pigmentation in one eye. [88]
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.
Women have this one down, too—we volunteer more than men, according to the U.S. Bureau of Labor Statistics. Nearly twice as many women than men did it on an average day in 2022. The science here ...
This is a list of notable people who have been documented as having heterochromia iridis, a condition when the irises have different colours. People who are frequently mistakenly thought to have heterochromia are not included, but may be listed in the Notes section.
Factors such as body weight at 10 years old and maternal smoking around birth were shown to have an impact 30 to 80 years later. ... over the life course explained a large proportion of premature ...
However, because organisms (including humans) can be carriers of genes for albinism without exhibiting any traits, albinistic offspring can be produced by two non-albinistic parents. Albinism usually occurs with equal frequency in both sexes. [10] An exception to this is ocular albinism, which it is passed on to offspring through X-linked ...
It is now commonly thought that the description refers to Waardenburg syndrome type 1. The description focused on the distinguishing feature of dystopia canthorum, the wide distance between the eyes observed in over 80% of patients with type 1. [1] [2] Variations in type 1 and the difference from type 2 were later described by Arias in 1971.