Ons 2nd wave migrated to rest of world wave of

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Unformatted text preview: ed from Ter?ary progenitors (NW monkeys, guinea pigs, etc) –  Allochthonous – dispersed Pleistocene (Mountain lion) –  Allochthonous – dispersed recent (Caale egret) Phylogeography – processes that govern the geographic distribu?on of lineages of genes Inference of population history from the geneology that connects genes sampled from different geographic locations. Map gene trees among populations onto geographic distribution of a species Primitive maize landraces show distinct patterning of allelic distribution across SA which reflect routes of entry from Mesoamerica. Allelic pattern also reflected in archaeological samples of maize collected from Andean regions and lowland Brazil (Freitas et al 2003). 19 4/12/13 Human Phylogeography •  Origin of modern human popula?ons – –  Mul? ­regional hypothesis –  Replacement hypothesis •  Vigilant et al (1991) used mtDNA and parsimony, ?me es?mate  ­ 166,000 – 249,000 years; Greatest gene?c diversity in Africa = Support out ­of ­Africa •  Cri?cized – Only 1 tree, other equally parsimonious trees not support Mitochondrial Eve •  Other studies –  Ruvolo et al (1993), Eve = 129,000– 536,000 YA –  Horai et al (1995) – En?re mt genome – Eve = 125,000 – 161,000 –  Bowcock et al (1994) – micro satellites confirm gene?c diversity greatest in Africa –  Goldstein et al (1995) – Micro satellites dates, 75,000 – 287,000 YA •  Balance of evidence suggests modern Homo sapiens evolved recently (100,000 ­300,000 YA) from African popula?ons. 2nd wave migrated to rest of world. Wave of dispersal of “modern” Homo sapiens replaced archaic form without interbreeding •  Consistent with high degree of gene?c similarity among humans Calibration Date est. (ka) Ref Ph...
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This note was uploaded on 02/02/2014 for the course ECOL 335 taught by Professor Reinthal during the Spring '10 term at University of Arizona- Tucson.

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