Bis2C%20Lecture%206%20F%202010

Bis2C%20Lecture%206%20F%202010 - Fall 2010 Keen Lecture 26....

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Unformatted text preview: Fall 2010 Keen Lecture 26. Phylum Porifera (sponges) (10 November) major lineages of animals sponges Students should be able to: describe the most important cell type in sponges explain how this cell functions explain the principle of continuity use the principle of continuity to predict water velocity within a sponge analyze the efficiency of three sponge body plans predict the most common body type in modern sponges Multicellularity, diplontic life cycle, unique cell junctios, blastula, Choanoflagellates cell ovoid, with a collar of microvilli (tentacles) surrounding the single flagellum movement of flagellum (1) locomotion and (2) feeding (bacteria trapped on collar) Sponge choanocyte Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates, sponges, and a few other metazoans) 2. DNA sequence data 3. Choanoflagellates have homologues of metazoan cell signaling and adhesion genes E.g., the Hedgehog gene (involved in cell signaling) is known in metazoans and choanoflagellates, but not other non-metazoan taxa (Ruiz-Trillo et al., 2008) Major lineages of metazoans See also Table 31.1 (p. 683) Sponge features: biology...
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This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

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Bis2C%20Lecture%206%20F%202010 - Fall 2010 Keen Lecture 26....

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