ch.6 anthro notes

ch.6 anthro notes - Ch.6: Human Variation and Adaptation...

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Ch.6: Human Variation and Adaptation Racial Classification: Clines: gradual genetic shifts incompatible with discrete and separate races humanity lacks race because human populations have not been isolated enough from one another to develop into such discrete groups. 94% of physical variation lies within so-called racial groups -therefore greater variation within “racial” groups than between them phenotypical similarities and differences don’t necessarily have a genetic basis Dark v. Light Skin Color: variation in human skin color results from a balancing act between the evolutionary needs to (1) protect against all UV hazards and (2) have an adequate supply of vitamin D Dark skin: melanin as a natural sunscreen Advantages: screens out UV in tropics, reduces susceptibility to folate destruction and to NTDs, prevents sunburn and enhances sweating and thermoregulation, reduces disease susceptibility and risk of skin cancer. Disadvantages:
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This note was uploaded on 02/09/2012 for the course ANTHRO 101 taught by Professor Staff during the Fall '09 term at Emory.

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ch.6 anthro notes - Ch.6: Human Variation and Adaptation...

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