Postlab 7 - F23 template-1

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University of California, Davis *

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2C

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Biology

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Dec 6, 2023

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docx

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Your Name: Section: Postlab 7: Introduction to Metazoa Directions: Complete the questions below by the start time of your next lab. Be precise in your answers and pay attention to your reasoning. Your postlab is worth 5 points total . Question 1 (1 point total) Scan and attach the completed metazoan traits activity from the start of lab 7 in your lab manual. Be sure to complete steps 1-3 (listed on pg. 228) and attach the completed phylogeny (pg. 229) and table (pg. 230) Question 2 (2 points total) 2a. (0.5 points) What is cephalization? (20-word limit) 2b. (1.5 points) Identify four animals that lack cephalization and one that is cephalized. Each of your four animals that lack cephalization should have a different type of symmetry. In the chart below, list the names of these organisms and then give an example of a cephalized organism and provide its type of symmetry. Lacks cephalization Lacks cephalization Lacks cephalization Lacks cephalization Cephalized Organism: Symmetry: Asymmetrical Radial Pentaradial Bilateral Question 3 (1 points total) 3a. (0.5 points) What type of symmetry is found in the organisms with cephalization? (20-word limit) 3b. (0.5 points) Identify one organism from lab this week that is an exception to the association that you discovered in part ‘a’ (i.e. it has the type of symmetry mentioned in a, but is not cephalized). What feature(s) of this organisms’ life history do you think contribute to it not sharing the association in part ‘a’? (50-word limit)
Name: ______________________________ Section/ TA: _______________ Points: ________ /5 Question 4 (1 points total) Fill-in the blanks below based on your observations in lab this week. Be specific in your answers to receive full credit. Organism Phylum Symmetry Development (protostome/ deuterostome/neither) Gut type (1-way/ 2-way / none) Feeding (filter, predator, etc) On the lab practical, how would you visually tell the difference between this animal and a: 1. Tunicate Sponge 2. Sponge Acorn barnacle 3. Sea cucumber Nudibranch 4. Mussel Chiton 5. Anemone Sea urchin 2
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