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2. Human hair color - Wikipedia

   en.wikipedia.org/wiki/Human_hair_color

   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).

3. Phenotypic trait - Wikipedia

   en.wikipedia.org/wiki/Phenotypic_trait

   Underlying genes, that make up the genotype, determine the hair color, but the hair color observed is the phenotype. The phenotype is dependent on the genetic make-up of the organism, but is also influenced by the environmental conditions that the organism was subjected to during its ontogenetic development, [7] including various epigenetic ...

4. Fischer–Saller scale - Wikipedia

   en.wikipedia.org/wiki/Fischer–Saller_scale

   The Fischer–Saller Scale, named for eugenicist Eugen Fischer and German anthropologist Karl Saller , is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: [1] [2] [3] [4]

5. Genotype - Wikipedia

   en.wikipedia.org/wiki/Genotype

   Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location. [2] The number of alleles an individual can have in a specific gene depends on the number of copies of each chromosome found in that species, also referred to as ploidy. In diploid species like humans, two full sets of ...

6. Human variability - Wikipedia

   en.wikipedia.org/wiki/Human_variability

   The trait is still the result of variance in genetic sequence between individuals as a result of inheritance from their parents. Common traits which may be linked to genetic patterns are earlobe attachment, hair color, and hair growth patterns. [10] In terms of evolution, genetic mutations are the origins of differences in alleles between ...

7. Agouti-signaling protein - Wikipedia

   en.wikipedia.org/wiki/Agouti-signaling_protein

   Agouti-signaling protein is a protein that in humans is encoded by the ASIP gene. [5] [6] It is responsible for the distribution of melanin pigment in mammals.[7] [8] Agouti interacts with the melanocortin 1 receptor to determine whether the melanocyte (pigment cell) produces phaeomelanin (a red to yellow pigment), or eumelanin (a brown to black pigment). [9]

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9. Black hair - Wikipedia

   en.wikipedia.org/wiki/Black_hair

   This gene is demographically common, as 90% of the total world population carries this gene. Black hair, along with brown hair, comes to turn grey in old age as the hair follicles can no longer produce the pigmentation, but the cause of this inability has yet to be determined. [14]