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Lecture_22_Humans - Hominid Evolution A ll h o m in id s p...

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1 1 Hominid Evolution All hominid species originated in Africa – Fossil evidence – Genetic evidence (closest non-Human species) Early hominid species spread to Eurasia – Fossil evidence 2
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2 3 First appearance of of Hominids 4 Modern Homo Sapiens Archeological/Fossil Evidence: – Africa 160,000 years ago – Outside Africa 50,000 years ago Genetic Evidence: – Common African ancestor 190,000 years ago – Outside Africa by 60,000 years ago
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3 5 Modern H. sapiens Archaic H. sapiens Earliest Modern H. sapiens fossils found in East Africa about 160,000 years ago 6 Archaic H. sapiens
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4 7 Modern H. sapiens 8
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5 9 10
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6 11 12 Given enough time, a population will have a common maternal ancestor
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7 13 Mitochondrial DNA Clock All humans share common maternal ancestor Mutations accumulate in the DNA of the mitochondria at a set rate Humans with more similar mitochondrial DNA have a more recent common ancestor 14 A. Olivieri et al., Science 314, 1767 -1770 (2006) Fig. 1. Schematic representation of the worldwide phylogeny of human mtDNA Modern Humans: 190,000 years ago Modern humans out of Africa: 60,000 years ago
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