Week 7 Lab Problem Solving - Phylogeny Analysis I

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University of California, Los Angeles *

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Course

153A

Subject

Anthropology

Date

Apr 3, 2024

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pdf

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Week 7 Lab Problem Solving – Phylogeny Analysis I Learning Objectives • Differentiate between the three common representations of phylogenies and correctly interpret the data presented in them • Evaluate the relationships between various groups of organisms based on a phylogeny. • Identify sister and monophyletic groups on a phylogenetic tree. This activity will be completed and submitted as a group. Each member of your group must lead the discussion for at least one problem. Before you begin , determine how you will distribute responsibilities amongst your group members evenly. 1. With your lab group, discuss how to determine relatedness on a phylogeny and the three common representations of phylogenies. Then, confirm with a neighboring group, LA, or TA before summarizing your groups discussion here. [Question 2-4] Examine the phylogeny of extant perissodactyls. You can ignore the numbers on branch lengths and nodes. 2. What type of evolutionary tree is represented here? Explain what information presented by the tree led you to your answer. 3. Are tapirs more closely related to rhinos or horses? Give a justification for your response. 4. Do tapirs form a monophyletic group based on this evolutionary tree? Why or Why not? [Question 5-6] Consider the chronogram for the following activity. 5. When was the original split between rhinoceroses and tapirs? 6. How many millions of years ago did the most recent common ancestor give rise to all living tapirs?

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