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lecture05 - BioEE 278 Evolutionary Biology FOSSIL RECORD II...

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BioEE 278 Fall 2007 Evolutionary Biology Lecture 5 FOSSIL RECORD II Origin of Humans A. Origin of Humans within Primates a. Within Mammals, primates are most closely related to tree shrews (S.E. Asia). Primates: greater emphasis on vision over olfaction; eye sockets completely encircled by bones, increased brain size, grasping hands and feet; elaboration of placenta accompanied by longer gestation periods. b. Within Primates, humans are grouped with Old world Monkeys and Apes. c. Within Old World Monkeys and Apes, humans belong to the group of Great Apes (African and S.E. Asia). d. Relationships within the Great Apes: - Traditional view [(Orangutan, Chimp, Gorilla) & Human], based on morphology. - Molecular DNA data show [Orangutan & (Chimp, Gorilla, Human)]. e. How are gorillas, chimps and humans related? - Traditional view [(Chimp, Gorilla) & Human], based on morphology. - Molecular DNA data show [(Gorilla( & (Chimp, Human)]. - Chimps, gorillas all diverged in a short time from a common ancestor ~5-7myr.
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