Cladistics_exercise[1]

Cladistics_exercise[1] - 8. According to the cladogram,...

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Cladistics: Concepts and Terminology Use the evolutionary tree below to answer the following questions. 1. Name 5 characteristic possessed by birds. Which is/are synapomorphies? Which is/are symplesiomorphies? 2. Name two characters possessed by reptiles and birds. Which is/are synapomorphies? Which is/are symplesiomorphies? 3. Name four characters possessed by mammals. Which is/are synapomorphies? Which is/are symplesiomorphies? 4. Can a character be both a synapomorphy and a symplesiomorphy? Explain. 5. What is the function of a symplesiomorphy in cladistics? 6. Identify all of the autapomorphies on the cladogram. 7. According to the cladogram, which evolved first, the amniotic egg or hair?
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Unformatted text preview: 8. According to the cladogram, which evolved first the amniotic egg or keratinized skin? 9. According to the cladogram, which evolved, keratinized skin or hair? 10. Does the group of dinosaurs + birds constitute a monophyletic group? 11. Do the traditional reptiles (turtles, lizards, snakes, crocodilians, and dinosaurs) represent a monophyletic group? Explain. 12. Does a group composed only of endothermic animals constitute a monophyletic group? 13. What is the sister group to dinosaurs? To birds? To crocodiles? 14. What is the sister group to mammals?...
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This note was uploaded on 09/23/2011 for the course SCI 240 taught by Professor Staff during the Spring '11 term at S.F. State.

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