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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.
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).
German footballer Lars Unnerstall, who has blond hair and a blond beard. Blond (MASC) or blonde (FEM), also referred to as fair hair, is a human hair color characterized by low levels of eumelanin, the dark pigment. The resultant visible hue depends on various factors, but always has some yellowish color.
Due to a genetic mutation, a human was born with a tiny switch right before the OCA2 gene, that limits the expression of the melanin -- kind of like diluting the stream of the protein.
Mutations in a single copy of SNAI2 have also been found to cause patches of hair depigmentation without any other symptoms. [25] Type 2E is caused by an autosomal dominant mutation in the gene SOX10. [4] Rarely, a mutation in a gene other than those currently known may be responsible for a Waardenburg syndrome with features of type 2.
(An equivalent mutation produces the points pattern in Siamese cats. [10]) Another variant of OCA1b, called Albinism, yellow mutant type, is more common among the Amish than in other populations. It results in blonde hair and the eventual development of skin pigmentation during infancy, though at birth is difficult to distinguish from other types.
This phenotype is due to a mutation in the same gene that results in Type IV oculocutaneous albinism in humans. [6] Leucism is often used to describe the phenotype that results from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair, or feathers during development.
Say what you will about those with red, or "ginger," hair. But the gene that causes the unique hair color may be on its way out. The UK's Daily Record reports researchers in Scotland have claimed ...