Ward_Lect25A_Metazoa_ppt

Ward_Lect25A_Metazoa_ppt - BIS2C Winter 2010 (Ward) Lecture...

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Unformatted text preview: BIS2C Winter 2010 (Ward) Lecture 25. Introduction to Metazoa (animals) Todays lecture (19 February) recap: eukaryote tree metazoan features major lineages of animals animal body plans & development Wednesdays (Feb 24) lecture body plans & development (contd) sponges (Porifera) From: Lane & Archbold. 2008. Trends Ecol. Evol. 23:268-275 Which of the following statements is false ? 1. Fungi and animals are sister taxa 2. Fungi are more closely related to animals than to plants. 3. The closest living relatives of animals are the choanoflagellate protists 4. Metazoans are a monophyletic group Major eukaryote lineages Land plants Major eukaryote lineages Land plants Fungi Major eukaryote lineages Metazoa Land plants Fungi Major eukaryote lineages Which of the following features characterizes opisthokonts as a group? 1. Haplontic life cycle 2. Reduction of dikaryon stage 3. Flagellum, when present, single and posterior 4. Multicellularity Choanoflagellates small group of aquatic heterotrophic eukaryotes ca. 140 species, some unicellular, others colonial cell similar in structure to sponge choanocytes 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) 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) 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) Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges) Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges) 2. Structure of mitochondria Evidence that choanoflagellates are the sister group of Metazoa 1. Collar cells (shared between choanoflagellates and sponges) 2. Structure of mitochondria 3. DNA sequence data Ruiz-Trillo, I. et al. Mol Biol Evol 2008 25:664-672; doi:10.1093/molbev/msn006. Black dot: PP 1.0; red dot: PP 1.0, ML BS 100% Phylogeny of the opisthokonts based on concatenation of 110 nucleus-encoded proteins Ruiz-Trillo, I. et al. Mol Biol Evol 2008 25:664-672; doi:10.1093/molbev/msn006....
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Ward_Lect25A_Metazoa_ppt - BIS2C Winter 2010 (Ward) Lecture...

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