are all humans originated from africa
In the middle of this region lies the Great Rift Valley—often referred to as the cradle of humanity.. (See a map of Africa .). Some researchers believe that modern humans are at least in part the product of non-African species descended from Homo habilis, which left Africa at least 1.5 million years ago. (Related: China's Earliest Modern Human Found [April 3, 2007].). Individual members of this species and other later homo did not all come from Africa. Recent studies on ribosomal DNA indicates that all modern humans had a common ancestor in northern Africa. ANS:Yes, all humans originated in Africa. Scientists have determined that the region that is now Ethiopia was a likely place for the first humans to have evolved. From there they slowly spread out. The dating for Eve was a blow to the multiregional hypothesis and a boost to the theory of the origin and dispersion of modern humans from Africa, replacing more archaic human populations such as Neanderthals. As a result, a consensus emerged among anthropologists that the latter theory was more plausible. Analogous to the Mitochondrial Eve is the Y-chromosomal Adam, the member of Homo sapiens sapiens from whom all living humans are descended patrilineally. The inherited DNA in the male case is his nuclear Y chromosome rather than the mtDNA. In human genetics, Mitochondrial Eve is the matrilineal most recent common ancestor (MRCA), in a direct, unbroken, maternal line, of all currently living humans, who is estimated to have lived approximately 100,000–200,000 years ago. For migrations of early humans, see Out of Africa I. In paleoanthropology, the recent African origin of modern humans, or the out of Africa theory (OOA), is the most widely accepted model of the geographic origin and early migration of anatomically modern humans. Freedom and justice are best served not through the dead weight of an enforced 'equality', but through the recognition of differentiation, for it is in the differences that humanity can best be appreciated and valued. ANS:One theory states that all humans originated in Africa. Some scientists hypothesize that the region that is now Ethiopia was a likely place for the first humans to have evolved. From there they slowly spread out. 1 Just a few thousand years before the most recent single ancestor shared by all living humans was the time at which all humans who were then alive either left no descendants alive today or were common ancestors of all humans alive today. Such groups include the Neandertals of Europe and western Asia, archaic human types in eastern Asia and Australia, and perhaps even the controversial hobbit humans from the Indonesian island of Flores. Trinkhaus is critical of the latest findings. (Related: Neandertals, Modern Humans May Have Interbred, Skull Study Suggests [January 16, 2007].). Certain genetic and anatomical traits cannot be explained as a simple and complete expansion of modern humans out of Africa, he said. The 'out of Africa' hypothesis of human migrations 200,000 years ago was proposed by Wilson and Cann in 1992 (Allan C. Wilson and Rebecca L. Cann, The Recent African Genesis of Humans, Scientific American 1992, no. 266: 68-73.).
Yes