Biology 1001A Lecture Notes - Lecture 21: Paleontology, Species Problem, Homo Sapiens
7 Mar 2016
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2 main theories about dispersal of our ancestors from africa: african hypothesis early hominin descendants (archaic humans) left africa and established pops in middle east, asia and europe. Australia and the americas are decedents of single migration out of africa: multiregional hypothesis pops of homo erectus and archaic humans ad spread around much of europe and asia by 500 thousand years ago. Modern humans evolved from descendants of those earlier dispersals. Gene low prevented reproductive isolation and maintained them as single but variable species. Rapid exodus of anatomically modern humans out of african occured in coast of indian ocean. Early emigrants may have taken advantage of lower sea levels to move along the arabian coast around 60 thousand years ago. Earliest dispersal occurred in attirampakkam, india fossils indicate that achuelian humans (homo erectus) had occupied this sit by 1. 5 mya. 1 mya hominins were on flores island/indonesia.
