BIOL 1108 Lecture Notes - Lecture 5: Sahelanthropus, Homo Ergaster, Lake Turkana
Document Summary
Questions of lineage for all organisms have three potential pools of information that will then inform the systematics. Old world is everything else because of the way that pangea split up. The characters listed in the ancestral lineages do not represent all of the most important evolutionary changes that occured in the ancestors, but rather a sample of the changes that occured at each stage. Chimpanzees are the closest relatives to humans. Opur anatomy does not show us which features evolved first or second. 7 million years ago, hominins already begun the process of splitting off the ancestral group they shared with chimps. Hominids refers to the hominidae - family of apes. Modern humans did not evolve from chimps. Humans evolved from the same common ancestor as chimps. Hominins have been walking upright for at least 3. 2 million years. Ardipithecus ramidus (ardi) was bipedal on land but quadrupedal in trees. Between ardi and australopithecus afarensis, hominins went fully bipedal.
