Out of Africa. I think I understand this concept but want to check. Homo habilis, Homo erectus, Homo neanderthalensis, Homo sapien - all of these hominids originate in Africa. Each migrated separately and then became extinct. There is not a direct link between any of these hominids, e.g. a subset of Homo habilis did not mutate into Homo erectus. Each group originated in Africa and then spread. Is this source in Africa thought different or to be the same for all of the above mentioned hominids? Is the chromosome number for habilis and erectus known?