ANTH 350 Lecture Notes - Lecture 22: Folate Deficiency, Frostbite, Dark Skin
Document Summary
Skin color variation: skin color skin color variation in populations. Cold injury- arose from looking at medical records of soldiers from korean war. Dark skinned men in winter more likely to get frostbite. Ethiopian 3x more likely than american to get frostbite. African americans 4-6x more likely to get frostbite than white people. Only affects light people-normally reflectance increased in wavelengths. At this wavelength, green light reflected in hemoglobin. Their lack of melanin doesnt block green light (light people. : genetics and skin color. Six genes seem to contribute to global variation in skin color; mc1r (melanin and pigmentation. ) Oca2 (associated with albinism) also related to normal range of pigmentation. Mc1r, oca2, asip all related to global skin color variation. Slc24a5, matp (protein that leads to depigmentation) typ all related to lighter skin in. Light skin appears to have been evolved separately in europeans and east asians. Coevolution: neanderthal skin and hair color.
