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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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- Fall '10