Lecture+9-3 - Lecture 9: Modern Humans Out of Africa. Why...

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Lecture 9: Modern Humans Out of Africa. Why Africa? Why leave Africa? Homo Habilis appears 2.4-1.7 million years ago. Cranial capacity of 700-800 cc . Arms were still long. Body as small as A. afarensis. Only 200,000 years later, H. habilis had evolved into Homo Erectus (which lived from 1.6 mya-300,000 bp). Modern body and limbs. Bigger brain, between 900 and 1250 cc . Why the rapid pace of evolution? Punctuated equilibrium ? Bigger brains, better tools ( Acheulian ), more reliance on hunting, smaller molars and jaws, larger brow ridge (superorbital torus) to support pulling muscles, larger front teeth. Culture, inclusive fitness, and group selection (plus) natural selection based on individual differential success. From Darwinian to increasingly Lamarckian selection . Tool-making traditions : Paleolithic (lower, Acheulian, H. erectus; middle, Mousterian, archaic H. sapiens, Neandertals; upper, blade tools, H. sapiens sapiens). Immature birth , dependency, rapid skull and brain growth. (Brain becomes formatted disk with increasing memory. Big, empty brains, ready to be filled with cultural
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This note was uploaded on 02/17/2011 for the course ANTHRCUL 101 taught by Professor Kirsch during the Fall '08 term at University of Michigan.

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Lecture+9-3 - Lecture 9: Modern Humans Out of Africa. Why...

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