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Anthro lecture 4 - Anthro lecture 4 Natural selection-Acts...

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Anthro lecture 4 15:59 Natural selection-Acts on variation present (human variation) Selection on traits o Strong= rapid evolution or extinction Depends on variation present o Weak or none= slow evolution or no change Permits variation to accumulate Variation in traits o Discrete  E.g., ABO blood group (4 phenotypes) o Continuous E.g., Height; weight; skin color Biology of skin color o 3 chemicals melanin carotene hemoglobin o multiple functions of skin all humans: o similar # of melanin producing cells o differ in rate of melanin preduction more pigment  darker skin less pigment   lighter skin UV radiation o Sun    stimulates melanin
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stimulates  vitamin D o need for teeth, bones, calcium absorption o UV light—synthesis of vitamin D in body Stored in fat during winter Found in some foods, added to others
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