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The full genetic basis of hair color is complex and not fully understood. [1] Regulatory DNA is believed to be closely involved in pigmentation in humans in general, [2] and a 2011 study by Branicki et al. identified 13 DNA variations across 11 different genes that could be used to predict hair color. [3]
Red hair, also known as ginger hair, is a human hair color found in 2–6% of people of Northern or Northwestern European ancestry and lesser frequency in other populations. It is most common in individuals homozygous for a recessive allele on chromosome 16 that produces an altered version of the MC1R protein.
The concept of "race" as a classification system of humans based on visible physical characteristics emerged over the last five centuries, influenced by European colonialism. [ 12 ] [ 18 ] However, there is widespread evidence of what would be described in modern terms as racial consciousness throughout the entirety of recorded history .
Autosomal dominant A 50/50 chance of inheritance. Sickle-cell disease is inherited in the autosomal recessive pattern. When both parents have sickle-cell trait (carrier), a child has a 25% chance of sickle-cell disease (red icon), 25% do not carry any sickle-cell alleles (blue icon), and 50% have the heterozygous (carrier) condition. [1]
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.
Kant published an essay Von den verschiedenen Racen der Menschen "On the diverse races of mankind" in 1775, based on the system proposed by Buffon, Histoire Naturelle, in which he recognized four groups, a "white" European race (Race der Weißen), a "black" Negroid race (Negerrace), a copper-red Kalmyk race (kalmuckishe Race) and an olive ...
A 2023 scoping review of the literature found that in studies conducted in multiracial or multiethnic populations, the inclusion of race or ethnicity variables lacked thoughtful conceptualization and informative analysis regarding race or ethnicity as indicators of exposure to racialized social disadvantage, the systemic and structural barriers ...
Black hair can come in a variety of textures, just as any hair color. Generally, the East Asian, Central Asian and Native American population has straight hair with a very thick cuticle layer [ 5 ] and South Asians have thick, wavy or curly hair , [ 6 ] while the general hair type seen in black African hair is thick, curly and dense with more ...