ANTH 002 Lecture Notes - Lecture 6: Lactose Intolerance, Mechanistic Organic Photochemistry, Melanin
9 Jun 2020
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Human variation (body morph, skin pigmentation, nasal morph, sickle-cell anemia, lactose intolerance) Ape subspecies neatly cluster, no such neat clustering for humans. Genetic bottleneck: pop reduced to small # Evidence demonstrated small pop of humans began a great migration out of africa. We have a much larger geographic range, and been adapting to many different. 2 rules for relationship of body proportions and climate. Mammals tend to have bulkier bodies in cold temperature climates. As mass increases the relative amount of surface area decreases proportionately. Greater mass allows for greater heat retention and reduce heat loss. Colder -> bulkier bodied mammals (rabbits, foxes) Organisms in cold climates tend to have shorter extremities. In warmer climates, longer appendages are more adaptable. Ex: cold climate -> white short appendages. Hot climate -> shorter limbs (jackrabbit have longer limbs, long ears (cool themselves off during the heat, slimmer bodies) John relethford measured skin color of humans via light reflected.
