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The MC1R gene is a prime example of a human gene influencing appearance, though it is primarily known for determining hair and skin pigment (red hair, fair skin, freckles) rather than eye color. While sometimes used to illustrate basic Mendelian recessive traits, it acts more as a modulator, with mutations altering the melanin ratio (pheomelanin vs. eumelanin). [1, 2, 3]
Key Details on MC1R Gene & Appearance:
Primary Function: MC1R regulates the production of melanin in skin and hair cells.
“Red Hair” Gene: Mutations in this gene cause a switch from
brown/black pigment (eumelanin) to red/yellow pigment (pheomelanin). Associated Traits: MC1R variants are linked to lighter skin, freckles, and a higher risk of sun sensitivity/melanoma.
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