kt leitl. genes in hair color aren’t fully established. theory – at least two gene pairs control...
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![Page 1: KT Leitl. Genes in hair color aren’t fully established. Theory – At least two gene pairs control human hair color Two pigments for hair color: Eumelanin](https://reader035.vdocuments.site/reader035/viewer/2022062301/56649c885503460f9494053b/html5/thumbnails/1.jpg)
Hair Color: Traits and GenesKT Leitl
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Basic Facts of Human Hair• Genes in hair color aren’t fully established.• Theory – At least two gene pairs control human
hair color• Two pigments for hair color: Eumelanin and
Pheomelanin
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Eumelanin• Eumelanin – The two subtypes determine the
darkness• Black – High counts lead to blacker hair, lower counts
result in gray hair• Brown
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Pheomelanin• Pheomelanin - is
generally makes red
Phenotypes• Brown/Blonde• Brown – Dominant allele• Blonde – Recessive allele
• Non-red/Red• Non-red – Dominant
(suppresses pheomelanin• Red - Reccessive
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Brown Hair (Brunettes)
• Higher levels of (brown) eumelanin
• Lower levels of pheomelanin
• Medium to thick hairstrands
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Black Hair
• Most common• Ranging from soft
black, blue-black, and jet black
• Lots of eumelanin• Less dense color
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Blonde Hair
• Platinum blonde, dark blonde, strawberry blonde (most rare and contains the most pheomelanin)
• Only small amounts of pheomelanin and eumelanin (more creates ash blonde)
• Most blondes get darker with age
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Auburn Hair
• Ranges from light to dark red-brown
• Eumelanin (brown)• Pheomelanin (red)
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Chestnut Hair
• Red-ish shade of brown
• Darker than auburn
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Red Hair• Least common• Light strawberry, titan
vivid orange, copper, “true red” (least common)
• Caused by Mc1r (recessive)
• 67% pheomelanin• Lowest levels of
eumelanin• Most common in Scotland
(13% are, 40% carry the recessive gene)
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Grey and White Hair
• No actual pigment• Clear hair• Lack of pigment
and melanin• Color based on light
reflection• Generally in people
of age• As early as ten
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Gender In Hair
Men• Generally black of dark
hair
Women• Red and blond hair
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Works Cited• En.wikipedia.org/wiki/Human_hair_color • Google images