BIS2C Sect B W09 Final KEY

BIS2C Sect B W09 Final KEY - Biological Sciences 2C Sinha...

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Biological  Rizzo Winter Quarter  2009 Final  Examination Please Read the Instructions First. Check your pages--there are 16 pages in this exam (including this page). You are  responsible for making sure that you have all the pages. This examination is worth 150 points. Please bubble in the 9 digits of your student ID number on your scantron. Bubble the number from the bottom of the scantron into the scantron num- ber box.  Mark Test  Form B. Calculators cannot be used on the test. True/Fal     s    e/Matching Questions—30 questions worth 2 points each: 60 points      total Multiple Choice Questions—30 questions worth 3 pts each: 90 points total 1.  Indicate your answers on the scantron sheet using a number 2 or a test scor- ing pencil.  Press  heavily, don’t stray out of the margins and completely erase any changed answers. 2.  If you think that a multiple choice question is ambiguous or confusing, use the “explanation sheet” at the end of the examination to explain the problem.  Put your name on this  sheet—we tear them off to read them! Bonus Questions-4 questions, worth 8 pts total You have 120 minutes to complete the exam. 1
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True/False (2 points each) Indicate whether the following statements are true or false. A for true, B for false. 1. The process of gastrulation and the subsequent formation of at least two cell layers are synapo- morphic features of eumetazoans. 2. Beetles (order Coleoptera) account for about one quarter of the world’s described animal spe- cies. 3. Cephalopods have the most advanced nervous system of any marine animal. 4. A four-chambered heart evolved independently in mammals and birds. 5. The most parsimonious tree for a given taxon-character matrix is the tree that maximizes the amount of character state change. 6. Two closely related taxa that are of the same age are called sister taxa. 7. Hagfishes are the sister group to the remaining vertebrates. 8. Because sponges are a paraphyletic group this provides more information about the ancestral character states of Metazoa than if sponges were monophyletic. 9. Until about ten years ago insects and chelicerates were thought to be one another’s closest rela- tives. 10. Snakes form a monophyletic group but leglessness has evolved more than once in reptiles. 2
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Depicted above is an unrooted tree of four taxa. Indicate whether the following statements are true or false. 11. If the mantid is the outgroup, then beetle, fly and wasp form a clade. 12. Beetle and fly cannot be sister taxa under any possible rooting of this tree. 13. There are three possible rooted trees that correspond to this unrooted tree.
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BIS2C Sect B W09 Final KEY - Biological Sciences 2C Sinha...

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