AN1_Quiz7_Answers - ANTHRO 1 - Quiz 7 - Acceptable answers...

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ANTHRO 1 — Quiz 7 — Acceptable answers 1. Give the genus names of two fossil species that are considered potential ancestors of australopithecines. Briefly describe the anatomical evidence from any one of these specimens that has been used to suggest that they might be hominid ancestors. Sahelanthropus -- forward position of the foramen magnum = upright posture Ororin -- limb bones suggesting bipedalism, 6 MYBP date Ardipithecus -- forward position of the foramen magnum = upright posture -- teeth like australopithecines, limb bones suggesting bipedalism 2. Describe two skeletal features found in australopithecines that indicate that they were habitual bipeds. Angled distal end of femur (inward angle of the knee joint). Bowl-shaped pelvis. Central position of foramen magnum. Minimally divergent big toe. 3. Describe two skeletal features found in australopithecines that indicate that they still retained arboreal adaptations. Conical rib cage, high intermembral index (longer arms than legs), longer curved
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This note was uploaded on 02/07/2012 for the course ANTHRO 1 taught by Professor Wilkie during the Spring '08 term at University of California, Berkeley.

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AN1_Quiz7_Answers - ANTHRO 1 - Quiz 7 - Acceptable answers...

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