September18LecNotes07 - September 18th 2007 Transcribed...

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September 18 th 2007 Transcribed Lecture Notes from BioG 109 [transcribed by TA]. Correction: do not learn figure 18.22 the simplified figure that you need to learn is 18.4 Corrected term from previous lecture: “During development in protostomes, the gastrular opening becomes the mouth, in deuterostomes it becomes the anus.” In response to a student question: Dr. Greene highlighted why a classification of “invertebrate” vs. “vertebrate” was problematic. the concept of paraphylogeny was employed to make a better classification. (ppt) Dr. Greene presented a slide that presented “Some major variables in animal biology” including e internal cavities e types of symmetry e encephalization e segmentation e regionalization e exo vs. endo skeleton e Larvae and metamorphosis e naked egg, shelled egg, live birth (ppt) Echinodermata – sea stars and sea urchins Dr. Greene mentioned that the larval stage of sea stars exhibit bilateral symmetry. Dr. Greene asked about homology between sea stars and cnidarians
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This note was uploaded on 10/07/2009 for the course BIO G 109 at Cornell University (Engineering School).

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September18LecNotes07 - September 18th 2007 Transcribed...

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