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Unformatted text preview: -Indirect development is considered ancestral. Direct development is far less common appears to have evolved multiple times-ancestral echinoderms are thought to have had larvae, and those were lost many tim independently What has changed in development?-Fate mapping. What cells contribute to what tissues?-Origins of larvae-Possibly the larval forms might have been the original adult form-Life evolved in the water (we think)-Trochophore larva : present in a lot of phyla-Larve are able to skip the adult thing and become reproductively capable o But can they skip the adult stage permanently? o larvaceans do so Evolution of primary axis specification-...
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This note was uploaded on 10/24/2010 for the course BIOL 514 taught by Professor Goldstein during the Fall '10 term at UNC.
- Fall '10