L2 Handout - Lab 2 - Chordate Diversity

L2 Handout - Lab 2 - Chordate Diversity - Bio 1A Lab...

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A B C E F I J D H G derived character (in F, not B) Bio 1A Lab Lecture Outline # 2 Chordate Diversity Sept. 8 th , 2008 Overview: The cladogram on page A14 (in the packet of pre-labs and worksheets) will be helpful to review and you should bring it to the lab lecture (or look at it while watching the webcast). I Calendar A. 9/8: Chordate Diversity lab B. 9/15 Enzymes and start cloning exercises (read Spectrophotometer section, p. 11-14). C. Study resources – take advantage of them. II. Chordata: about 50,000 species A. Four features (make a drawing of the notochord 1) Notochord: Ant/Post., support, nonvertebrates – typically persists vertebrates – minimal amount, vertebrae and bands of muscle formed from somites (mesoderm) 2) Dorsal hollow nerve chord: swelling for brain, special senses encased in cranium (craniata) 3) Pharyngeal grooves/slits: eventually form jaws, gills, other structures 4) Muscular Post-anal tail: swimming propulsion See images in Campbell: 7 th ed. 34.3, 34.5, 8 th ed. 34.3, 34.4 B. Cladogram: See image Campbell 34.2 (7 th and 8 th ) 1) Appendix: A14, A51/52 (pre-labs, worksheets) C. Urochordates: Tunicates/sea squirts: 1) larval (short lived) form vs. adult fitler feeder D. Cephalochordates: Lancelets/ Amphioxus 1) filter feeder using cilia 2) axial skeleton retained, muscle somites present, minimal cephalization E. Craniata – have a cranium, brain with specialized sense organs (eyes with lenses, pressure receptors (ears - equilibrium, hearing, electro and chemical receptors), neural crest cells
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L2 Handout - Lab 2 - Chordate Diversity - Bio 1A Lab...

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