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Lecture6

Lecture6 - Animal Evolution...

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I. Animal Characteristics A. Most animals share the following characteristics: 1. Multi-cellular 2. Eukaryotic 3. Heterotrophy a. Ingestion b. Carbohydrates stored as glycogen 4. No cell walls a. Cell junctions i. Desmosomes ii. Gap junctions iii. Tight junctions 5. Differentiated body cells a. Hierarchal organization i. Tissues ii. Organs iii. Organ systems b. Permit specialized function 6. Nervous tissue a. Electrical and chemical communication among cells of the body b. Unique animal trait 7. Muscle tissue a. Movement b. Unique animal trait 8. Sexual reproduction a. Flagellated motile sperm b. Non-motile egg c. Diploid dominant life cycle d. Elaborate embryological development i. Cleavage to form blastula ii. Gastrulation of blastula to form tissue iii. Larvae that undergoes metamorphosis may be present II. Overview of Animal Phylogeny A. Parazoan 1. Lack tissue 2. Animals with tissue are classified eumetazoa 3. Simple anatomy B. Eumetazoa 1. Divisions Animal Evolution
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Lecture6 - Animal Evolution...

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