zoology notes 7 - CHAPTER 9 ARCHITECTURAL PATTERN OF AN...

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CHAPTER 9 ARCHITECTURAL PATTERN OF AN ANIMAL
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Introduction ± 32 major phyla of living multicellular animals. ± 500 million years ago 100 phyla had evolved representing nearly all major modern body plans. ± Major body plans are the result of extensive selection and are a limiting determinant of future adaptational variants. ± Animals share structural complexities that reflect common ancestry.
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A. Levels of Organization Protoplasmic Grade Unicellular organisms All life processes confined within the boundaries of a single cell Organelles perform specialized functions. Protozoans (amoeba, euglena)
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Cellular Grade Organism is composed of a variety of cells that form a specific function These cells cannot live alone as do protozoan cells. Simplest metazoans (multicellular animals) show a cellular grade of organization. No tissues Poriferans (sponges)
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Tissue Grade More complex metazoans exhibit a tissue grade organization Tissue: Groups of similar cells working together to perform a specific function. Cnidarians (Hydra, Corals)
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Specialized organs perform specific functions. Platyhelminthes (planaria,
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This note was uploaded on 04/26/2008 for the course BIO 1504 taught by Professor Williamson during the Fall '07 term at Mississippi State.

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zoology notes 7 - CHAPTER 9 ARCHITECTURAL PATTERN OF AN...

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