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BIO172W08Lec27CT - Biology 172 L e c t u r e 2 7 P a t t e...

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1 Lecture 27- Pattern Formation II: Chordates March 19, 2008 Today s Outline 1. Animal Body Plan - Germ layers - Symmetry & Body Axes 2. Gastrulation - Protostomes & Deuterostomes - Cell movements - Induction & the Organizer 3. Cell determination 4. Embryonic and somatic (‘adult’) stem cells Announcements Discussion this week: Stem Cells – Read article by Clark & Becker BEFORE CLASS Biology 172 Animal Body Plan = Architectural Design 1. Number of germ layers giving rise to distinct tissue types (three vs. two) 2. Type of body symmetry (radial vs. bilateral) 3. Presence or absence of body cavity ( coelom ) 4. Pattern of gastrulation (formation of germ layers, mouth and anus) Animal Phylogeny Three Germ Layers: Ectoderm Mesoderm Endoderm • “Tube-in-a tube” design Cavity in mesoderm = coelom Radial vs. Bilateral Symmetry Bilateral Symmetry >> Three Primary Body Axes Protostome “mouth first” vs. Deuterostome “mouth second” Invertebrates are Protostomes (except the echinoderms) Chordates are Deuterostomes
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