Lecture 14 Outline Chapter 32-33

Lecture 14 Outline Chapter 32-33 - Lecture 14: Introduction...

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Lecture 14: Introduction to Animals and Invertebrates 1. September 2011 2: What are animals? Protists: Mostly unicellular, some multicellular Fungi: Some unicellular, mostly multicellular Plants + Animals: All multicellular 3: What are animals? Plants: Autotrophic eukaryotes Fungi: Heterotrophic eukaryotes (external digestion) Animals: Heterotrophic eukaryotes (internal Digestion) 4. What are animals? Unique tissues: muscle and nervous (in all except sponges) Lack rigid cell walls (unlike plants and fungi)
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Structural support provided by extracellular proteins (e.g. collagen) Motile in at least some part of lifecycle Embryos pass through an early blastula stage
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7. Gradual development e.g. human 8. Non-gradual development – gradual development punctuated by METAMORPHOSIS. E.g. frog. 9. other example of metamorphosis – butterfly 10. Animal Development – Hox genes Development of body plan depends on regulatory Homeobox genes (e.g. Hox genes). Highly conserved across all animals Gene duplications provide greater anatomical complexity Small mutations lead to big changes in form Development of a fruit fly and a mouse are controlled by the same hierarchical network of Hox genes 11. Examples of Hox gene mutations
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13. First complex animals: Ediacaran fauna: 610-550 MYa. Diverse fauna. Now extinct. 14. Examples of Ediacaran fossils. Show radial or bilateral symmetry. Show segmentation. All invertebrates. 15. Image – showing reconstruction of the Ediacaran fauna.
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This note was uploaded on 11/08/2011 for the course BSC 2011C taught by Professor Klowden/crampton during the Fall '11 term at University of Central Florida.

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Lecture 14 Outline Chapter 32-33 - Lecture 14: Introduction...

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