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Download Unit 11 Animal Evolution Chp 32 Intro To Animal
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CHAPTER 32 INTRODUCTION TO ANIMAL EVOLUTION 1. Complete the following Charts: Prokaryote/ Eukaryote Uni/ Multicellular Asexual/ Sexual Life Cycle: Diploid/Haploid Auto/ Heterotrophic Cell Wall? Specialized Tissue Protozoans Animals Hox Genes? Adapations Protozoans Animals 2. Below is a diagram illustrating the early embryonic development of animals. Label the following events/structures: Cleavage, Blastula, Blastocoel, Gastrulation, Gastrula, the Germ Layers (Ectoderm, Endoderm), Blastopore 3. Below is the traditional view of animal diversity based on body-plan grades. Follow the steps upward starting at #1 Step #1: No true tissue vs. True tissue Step #2: Radial Symmetry vs. Bilateral Symmetry Which organisms (diagram to the right) illustrate radial symmetry and which illustrated bilateral symmetry? Label the following terms on the crawfish diagram: dorsal, ventral, anterior, posterior Diploblastic vs. Triploblastic “Diplo-“ and “Triploblastic” refer to the number of germ layers the organism possess. What are the 3 germ layers and what are their functions? Step #3: No Body Cavity vs. Body Cavities With reference to the body cavity, what is the difference between Acoelomates, Pseudocoelomates, and Coelomates? What is the function of the body cavity? Step #4: Coelom from Cell Masses vs. Coelom from Digestive Tube Distinguish between the following: A. Cleavage a. Spiral and Determinate b. Radial and Indeterminate B. Coelom Formation a. Schizocoelous b. Entercoelous C. Fate of the Blastopore a. Mouth b. Anus 4. Below is a sample of some of the animals that evolved during the Cambrian explosion. The picture to the right is actual fossils collected from the Burgess Shale in British Columbia, Canada. Most of the Cambrian fossils, as strange as they may appear, are simply ancient variations within the taxonomic boundaries of phyla still represented in the modern fauna. There are three main hypotheses for what caused the diversification of animals. Give some detail to each hypothesis. A. Ecological Causes (Predator/ Prey Relationships) B. Geologic Causes C. Genetic Causes (Hox Genes)
