Multiregional Evolution and The Punctuated Equilibrium Theory
Wolpoff suggests that after an African origin of Homo sapiens (including Homo ergaster/Homo erectus) and the subsequent migration of H. erectus throughout much of the globe with the exception of the Americas, local evolutionary events took place across the world (Africa, Europe, Asia, and when they were advantageous, they spread everywhere else. According to Wolpoff, populations of Homo evolved together as a single species. Change in Pleistocene populations did not involve speciation (the splitting of one species into two): all this time, the geographically distinct populations maintained small amounts of gene flow. This idea directly challenges the Out of Africa model, which claims Homo sapiens evolved recently as a new species in Africa, and then dispersed throughout the Old World, replacing the existing human populations without mixing with them.
In an earlier example of punctuated evolution preceding the global diffusion of Homo sapiens genes from Africa, some two million years ago, Wolpoff points to evidence of an earlier 'genetic revolution' that took place in a small group isolated from australopithecine forebears. "The earliest H. sapiens remains differ significantly from australopithecines in both size and anatomical details," he notes. "Insofar as we can tell, these changes were sudden and not gradual."
Read more about this topic: Milford H. Wolpoff
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