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Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin.
Blond hair is controlled by an allele that is recessive to most alleles responsible for darker hair, [1] but it is not a disappearing gene.. The "disappearing blonde gene" refers to a hoax that emerged in parts of the Western world in the early 2000s, claiming that a scientific study had estimated that blonds would become extinct within the next two centuries.
From an ethnic point of view, Roman authors associated blond and red hair with the Gauls and the Germans: e.g., Virgil describes the hair of the Gauls as "golden" (aurea caesaries), [91] Tacitus wrote that "the Germans have fierce blue eyes, red-blond hair (rutilae comae), huge (tall) frames"; [92] in accordance with Ammianus, almost all the ...
Together, they account for brown, green and blue, but not hazel or grey eyes. Science is still working on how we get those. All blue-eyed people can trace their ancestry back to a single human ...
The Fischer–Saller scale, named after Eugen Fischer and Karl Saller is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: A (very light blond), B to E (light blond), F to L (), M to O (dark blond), P to T (light brown to brown), U to Y (dark brown to black) and Roman numerals I to IV and V to VI (red-blond).
With brown eyes taking an overwhelming lead, all of the other eye colors have lower percentages. According to WorldAtlas , 8-10 percent of the world's population have blue eyes.
Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
The reason for this, is the pigment melanin, which also determines are hair and skin color. So melanin only really has one shade: brown! The more melanin you have in the iris of your eye, the ...