Lab 14 st - ) Lower body: more like humans Skull and upper...

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Lab 14 Human Evolution
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Evolutionary relationships among species are examined by: 1. morphology homologous characteristics: analogous characteristics: 2. Radiometric data 3. Molecular data cladogram :
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Primate evolution: arboreal life Grasping finger and toes Binocular vision Tactile pads on fingertips Complex social behavior Fingernails (no claws)
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Brachiation : movement using arms Is the characteristic that separated the evolutionary line that lead to humans and apes what parts of the body might be modified for brachiation?
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Bipedalism: movement in two legs This characteristic separated the line that lead to humans and other hominids Humans are the only leaving bipedal species. Bipedal ancestors: Lucy What characteristics indicate ability to walk upright?
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Lucy ( Australopithecus afarensis
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Unformatted text preview: ) Lower body: more like humans Skull and upper body: more chimp-like Why did we become bipedal? Skull Morphology Characteristics that changes over geological time brain size prognathism (prognathism: pro-forward, gnathism-jaws) teeth size (cooked meat is softer no need for big strong teeth and jaw muscles) foramen magnum sagittal crest occipital torus and protuberance post orbital constriction Radiometric dating Carbon dating 14 C 12 C half life 5 730 years Potassium Argon (K-Arc) dating: 40 K 40 Ar half life 1.26 billion years 11% decay to Ar, 89% decay to Ca We analyze samples that surround the sample of our interest such us a skeleton. Equation for K Ar t = 1/ { ln [ (1/x) (D/P) +1 ] }...
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This note was uploaded on 01/18/2012 for the course BIOL 191L taught by Professor Dr.dottydouglass during the Fall '10 term at Boise State.

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Lab 14 st - ) Lower body: more like humans Skull and upper...

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