Earth 101 –Cladistics Exercise Write Your Answers on a Separate Sheet

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Earth 101 –Cladistics Exercise Write your answers on a separate sheet and turn them in at the end of class. You may want to work on a rough draft of the cladogram (in part 3) before writing a clean, final version on your answers. Part 1. Examine the following cladogram and answer the questions. 1. What is the synapomorphy of the clade containing species D and E? 2. What is a plesiomorphic character of that clade? 3. What is the synapomorphy of the clade containing species A and B? 4. Which taxa have a sulfurous odor? 5. What character distinguishes species D from species E? 6. Are adorable eyelashes a synapomorphy or an autapomorphy? Part 2. Use the previous cladogram to answer the questions. 7. Traditionally, the five taxa are grouped into three families. Family 1 contains species A. Family 2 contains species B and C. Family 3 contains species D and E. Determine if each family is monophyletic, paraphyletic, or polyphyletic. 8. More recently, species A has been grouped in a family with species D and E. Is this advisable? Why or why not? 9. Determine if the following groups are monophyletic, paraphyletic, or polyphyletic. Species A, B, C. Species C, D, E. Species C and D. Species A and B. Species B, D, E. Part 3. Use the data matrix to construct the most parsimonious cladogram for the eight species. Species 1 (Sp 1) is the outgroup taxon. Sp 1 Sp 2 Sp 3 Sp 4 Sp 5 Sp 6 Sp 7 Sp 8 Circle (0)/Square (1) 0 0 0 1 0 1 1 0 Central circle 0 1 0 0 1 0 0 0 Side lobe 0 1 0 1 0 0 1 0 Triangle spines 0 0 1 0 0 1 1 1 Blue (0)/Yellow (1) color 0 0 0 1 0 1 1 1 Central diamond 0 0 0 1 0 0 0 0 10. What is the synapomorphy of the clade defined by the most recent common ancestor of species 4 and 8 and all of its descendants? 11. List the apomorphies that distinguish species 4 from all other species. 12. What is the synapomorphy of the clade defined by the most recent common ancestor of species 6 and 7 and all of its descendants? 13. List the plesiomorphic characters found in the clade defined by the most recent common ancestor of species 3 and 4. 14. What traits would you predict in the common ancestor of species 4 and 6? 15. What character evolved independently in different clades (convergent evolution)? 16. Is the group of taxa sharing the character “triangle spines” monophyletic, paraphyletic, or polyphyletic? .

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