P10-Lecture 24- Hominids II- April 7

P10-Lecture 24- Hominids II- April 7 - Announcements s...

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Unformatted text preview: Announcements s Friday: Krista's and Han's sections meet in Chemistry 0128 for exam. s Exam 2 Friday: x Chapters 26 34 x Lectures 14 - 24 (omit 31) s Exam review Today 6 7 pm x HJP 0226 Hominid Evolution s The point: x Not linear x Bipedal, then large brains 34.42 Homo neanderthalensis So close, and yet ... s Appear by 150,000 ya x Europe, Middle-East, East to Uzbekistan Homo neanderthalensis So close, and yet ... Homo neanderthalensis So close, and yet ... s Interbreeding with us? x Apparently not. 3 Molecular evidence 3 In some places, 50,000 years of close proximity with H. sapiens without evidence of interbreeding x Science November 17, 2006 3 Sequencing and analysis of Neanderthal genomic DNA. Rubin et. al s Anatomically x modern humans appear about 100,000 ya Africa and Israel x Much later elsewhere 3 Australia/Asia 3 Europe Homo sapiens 60,000 40,000 3 New World 11,000 H.n. H.s. s Flowering of culture Homo sapiens beginning at least 40,000 years ago x Much more sophisticated tools Homo sapiens s Symbolic art One possible history s Flowering of culture Homo sapiens beginning at least 40,000 years ago x Rituals 3 e.g Elaborate burial s Flowering of culture Homo sapiens beginning at least 40,000 years ago x Music Homo sapiens s Anatomically modern humans appear about 100,000 ya s Flowering of culture beginning at least 40,000 years ago x Much more sophisticated tools x Symbolic art x Rituals x Music Human Origins Multiregional vs. Out-of-Africa s Multiregional x (parallel hypothesis) Suggests ancient common ancestor of Homo sapiens (700,000 years) x Evolution from local populations of H. erectus, with gene flow x Some regional variations in H. erectus present in modern human populations Human Origins Multiregional vs. Out-of-Africa Human Origins Multiregional vs. Out-of-Africa s Out-of-Africa (Monogenesis or replacement hypothesis) x Suggests recent common ancestor of Homo sapiens (1-200,000 years) x Probably in Africa x Modern humans dispersed from Africa displacing other hominids. Human Origins Multiregional vs. Out-of-Africa Homo sapiens Replacement hypothesis Once out of Africa, humans migrated in 3 major directions: See Fig. 34.44 Figure 34.43 Human Origins s Out-of-Africa 3Fossil Multiregional vs. Out-of-Africa x Supported by: evidence 3Molecular evidence indicating recent divergence 3Molecular evidence placing Neanderthals far from modern humans 3Study of DNA in living humans suggests ancestors came from Tanzania Summary s Humans are anthropoid primates x Chimps are our closest living relatives x Split approximately 6 mya s By 4 mya, hominids still had small brains, but were already fully bipedal (A.afarensis) s Genus Homo appears about 2.5 mya x Larger brain and Oldawan tools x May hominids coexisting at this time s Homo erectus appears about 1.8 mya x In Indonesia by about 1 mya x More sophisticated tools Summary - continued s Pretty modern looking humans appear about 700,000 ya (H. heidelbergensis) x Africa s Neanderthals appear in Europe 150,000 ya x Separate species x Limited technology; no art; language? x Gone by 27,000 ya s Modern Homo sapiens appear 100,000 ya x Africa, Israel x Flowering of culture by 40,000 ya s Multiregional vs. Monogenesis models ...
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