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Biology Lab 9 Write Up

Biology Lab 9 Write Up - more modified b More later stages...

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Drew Rasmussen Penny Louka Biology 191 Lab 24 October 2010 Lab 9: Animal Development: Lab Write Up 1. ***See attached papers for sea star development drawings 2. ***See attached paper for chick embryo drawing 3. Cleavage is the point in the cell division cycle called “mitosis,” where the cell size is adequate to undergo division. Once the cell is at the point where it is ready to divide it cleaves, where it separates at the midpoint of the cell and forms two identical cells. 4. Neural cells are unique cells to vertebrates that can develop into a broad array of different tissue cells. Two of the cells derived from Neural cells are: melanocytes (melanin producing cells), and smooth muscle cells. 5. Somites give rise to the adult structures dermis, skeletal muscle, and vertebrae. 6. As organisms evolve, some changes occur in their developmental stages. a. In a more recently evolved organism, you would expect to see the later stages
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Unformatted text preview: more modified b. More later stages would be modified because, the earlier evolutions in populations would have changed the earlier stages, and these would have been passed down through generations. This would have left the later stages to be modified as the animal needed them to be. 7. The process is lengthy for the formation of the Lens, the process is as follows: a. As the optic vesicle from the lateral wall of the forebrain comes close to the overlying non-neural ectoderm, it induces the lens placode. b. The lens placode invaginates to form the lens vesicle c. The optic vesicle then forms the optic cup as it bends around the lens placode, providing the stimulus for the final lens induction. d. Once the lens has formed, crystalline proteins provide it with flexibility that allows it to be focused....
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