In: Conceptual issues in modern human origins research. Because of the random nature of genetic drift, some traits will retain regional continuity in the face of the overall impact of gene flow. Building on these theories, the Regional Continuity model of human origin argues that modern Homo sapiens developed from different regional populations of archaic Homo sapiens that had previously evolved from regional populations of Homo erectus. New York: Aldine de Gruyter. This is a difficult hypothesis to test since brains do not fossilize.
Schmitz, H Krainitzki, and S. Critics of multiregionalism have pointed out that no single human trait is unique to a geographical region i. In the 1950s and 60s, numerous hominins of these and other older lineages were found in East and South Africa: Paranthropus, H. Thorne realized that isolation is not necessary for long-term marked phenotypic differentiation if the peripheral populations of a species range are small. This is said to have occurred through population size changes at the peripheries populations were no longer small , increased gene flow, and Neolithic demic-replacements:.
With only some exceptions, much of the Pleistocene human variation did not survive the enormous population expansions and replacements of the latest Pleistocene and Holocene. That was 4-12 inches 10-31 cm. The mere existence of these fossils is evidence enough to prove that human evolution was far less cut-and-dried a process than the advocates of the replacement model of human evolution would like to suggest, and, in fact, rather astonishingly complex. The Upper Paleolithic lifestyle, as it was called, was based essentially on hunting and gathering. Most of these extinctions apparently occurred within a few hundred years. Neanderthals were apparently no match for the technologically advanced fully modern humans.
Although all the traits a - z individually would be present in African fossils, this point is often misunderstood or overlooked see below. Th e Bering Plain intercontinental land connection appeared between Siberia and Alaska as a result of sea levels dropping up to 450 feet 137 m. Origins of Modern Humans Current data suggest that modern humans evolved from archaic humans primarily in East Africa. It is now less varied and predominantly vegetarian around the globe with a heavy dependence on foods made from cereal grains. Proceedings of the National Academy of Sciences of the United States of America 104 18 : 7367—72. The y were very similar in appearance to modern Europeans. There may be uniqueness in combinations of traits, but no single trait is likely to have been unique in a particular part of the world although it might appear to be so because of the incomplete sampling provided by the spotty human fossil record.
In two studies by Habgood 1989, 1992 it was shown a limited number of traits combined might lend support to regional continuity: a unique set of 5 traits in North China associated with facial flatness 1. Wolpoff has also defended Wiedenreich's Polycentric hypothesis from being labeled polyphyletic. It is based on the enormous similarities amongst modern humans. The sequence is said to start with and , traced to , to specimens e. It is likely that the human species has been able to adapt to these and other new environmental pressures because it has acquired a steadily greater genetic diversity. Creation Defined in Biology, evolution is as a change in allele frequencies of a population. Males were 5 feet 4 inches to 6 feet tall 1.
More recent claims regarding continuity in skeletal morphology in Europe focus on fossils with both Neanderthal and modern anatomical traits, to provide evidence of interbreeding rather than replacement. This is the apparent paradox that Multiregional evolution addresses. Proponents of the multiregional hypothesis see regional continuity of certain morphological traits spanning the in different regions across the globe as evidence against a from Africa. This is a fascinating question to consider but impossible to answer because of innumerable unknown factors. Edgar Simon and Schuster, 1996.
Pope: Multiregional Evolution: A World-Wide Source for Modern Human Populations. Archaeological evidence Very interestingly, while Neanderthals and early Homo sapiens were distinguished from one another by a suite of obvious anatomical features, archaeologically they were very similar. Third, Homo erectus is theorized to be an extinct species of primitive man, able to walk upright. Of these occurrences, 19 were associated with continuous restricted gene exchange through at least 1. Lahr 1992, 1994 and Lieberman 1995 published similar findings.
After all, the humans we have compared belong to the same species, and we can hardly expect that, within species, regional groups can be characterized by single unique features that do not appear elsewhere. He had a mix of old and new anatomical features. For many anthropologists this represents the final evolutionary leap to full modernity. The answer is almost certainly yes. First, this model has its foundation in the work of Charles Darwin, who theorized that humans advanced over a vast amount of time, moving along the evolutionary ladder from apes to Homo sapiens. Finally, c an we say what direction human evolution will take in the future? Similarly, it is claimed that some Chinese facial characteristics can be seen in an Asian archaic human fossil from Jinniushan dating to 200,000 years ago. Curr Opin Genet Dev 16 6 : 606—10.