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9 Cards in this Set
- Front
- Back
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cline
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gradual shift in gene freq.s bet. neighboring pop.s
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descent
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rule assigning social identity on the basis of some aspect of one's ancestry
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hypervitaminosis D
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contitn caused by xs vit. D;
calcium deposits build up in soft tissues, and the kidneys may fail; symptoms include gallstones and joint and circulation prob.s; may affect unprotected light-skinned ppl in tropics |
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hypodescent
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rule that automatcly places children of a union or mating bet. memb's of diff socioeconomic grps in the less-privileged grp.
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melanin
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substance made in specialized cells in the lower epidermis (outer skin layer);
melanin cells in dark skin produce more melanin than those in light skin |
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natural selection
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as formulated by Darwin and Alfred Russel Wallace, process by wh. nature selects the forms most fit to survive and reproduce in a given environment
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rickets
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nutritional disease caused by a shortage of vit. d;
interferes w/the absorption of calcium and causes softening and deformation of bones. |
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social race
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a grp. assumed to have a biologcl basis but actually perceived and defined in a social context, by a particular culture rather than by scientific criteria
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tropics
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geographic belt extending 23 deg. N and S of the equator, bet. Trop.s of Cancer (N) and Capricorn
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