Handout 5 - BILD 3 – Fall 2008 Section Mon 9-9:50 AM...

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Unformatted text preview: BILD 3 – Fall 2008 Section: Mon 9-9:50 AM HANDOUT 5 I. Terms/phrases to know • Lecture 14 (10-27-08) o Taxonomy o Biological nomenclature system o Taxon (plural: taxa ) o Vascular tissue o Angiosperms o Double fertilization o Endosperm • Lecture 15 (10-31-08) o Chordate o Vertebrate o Notochord o Homeotic mutation o Macroevolution o Homeobox genes o Compound eyes Page 1 BILD 3 – Fall 2008 Section: Mon 9-9:50 AM o Ectopically II. Important concepts • Cambrian explosion : first appearance of many animal (and plant) phyla in fossil record o Why it might not have been an explosion? There was long “fuse” period of animal diversification that led up to explosion • Based on molecular evidence, it is suggested that 3 animal lineages had diverged from a common ancestor way before Cambrian period • Still, saw rapid radiation of animal species during Cambrian o (3) Possible explanations for swiftness of animal diversification during Cambrian? ________________________________________________________________ ________________________________________________________________ __ ________________________________________________________________ ________________________________________________________________ __ ________________________________________________________________ ________________________________________________________________ __ o So underlying problems with fossilization can explain why Cambrian period witnessed an “explosion” of different animal phyla • Taxonomy : science and practice of classification o All organisms are classified according to biological nomenclature system created by Linnaeus o Arrange organisms into different groups ( taxa ) based on differences in their genomes Page 2 BILD 3 – Fall 2008 Section: Mon 9-9:50 AM o Classify organisms starting with most inclusive (most broad) taxon, which is domain, and proceeding through less inclusive taxa o Mnemonic device to remember 8 subdivisions of nomenclature system...
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Handout 5 - BILD 3 – Fall 2008 Section Mon 9-9:50 AM...

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