ANTH 1001 : Test 2
Document Summary
Human bio-cultural adaption: examples: sickle cell and other red blood cell variants; lactase sufficiency. With long histories of dairying are typically lactose tolerant: mutation for ability to digest milk as adults would have provided a natural selective advantage. Human variation: our species is polytpic, definition: polytpism-phenotypically different pops. In a species: polytypism is result of diversity of environments that we inhabit. Diversify phenotypically (and genetically) because of natural selection, but our pops. Remain within a single species because of gene flow: race- not a biologically useful grouping of humans. Genetics similarities b/w heavily and lightly melanized individuals: all people have about the same # of melanocytes, compared to lightly melanized individual, heavily melanized individual, produces more melanosomes, has larger melanosomes, and, melanosomes are more dispersed in keratinocyte. Human adaptation to low temperature environments: body shape: body mass is higher in areas with lower temperatures, bergamann"s rule, allen"s rule, arms and legs are shorter in areas with lower temperatures.
