22_Animal_diversification

22_Animal_diversification - Animal diversification Today's...

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Animal diversification Today’s questions: hat are animals? I. What are animals? II. How did body plans change as animals diversified? I. What are animals? Feeding and moving machines Most recent phylogeny
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II. How did body plans change as animals diversified? A. Multicellularity and tissues All animals are multicellular Cells bind to each other Cells communicate Division of labor (some cells function in feeding vs. structure vs. reproduction) Multicellularity evolved independently in fungi, plants, and several types of algae. Are the processes above same or different?
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Origin of tissues (integrated groups of cells that perform a particular function) Epithelium in sponges? Germ layers (tissues) in mbryos embryos Ectoderm Endoderm Mesoderm
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here to map origin? Where to map origin? Tissues Ectoderm doderm Endoderm Mesoderm
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B. Body symmetry and cephalization Classically: Radial symmetry in diploblasts Bilateral symmetry in triploblasts
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22_Animal_diversification - Animal diversification Today's...

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