01_Feb16_slides-1 - 2/16/2011 1 Introduction to Animal...

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Unformatted text preview: 2/16/2011 1 Introduction to Animal Diversity Curt Daehler [email protected] Office hour Monday 9:30 ‐ 10:30 or by apt. 413 St John Building Learning objectives Define “animals” and explain how they differ from other groups of organisms Describe the evolutionary history of animals on Earth Explain how animals can be classified based on body structure and embryonic development Use a phylogenetic tree to interpret relationships among animals and among other organisms Identify major animal groupings and shared, derived traits on a phylogenetic tree of the major animal phyla What are animals? A. Chemoautotrophs B. Organisms that feed by absorption C. Organisms that are mobile D. All of the above E. None of the above Several characteristics, taken together, define animals Kingdom Animalia (Metazoa) EXTRACELLULAR FLUID Collagen Animals are multi-cellular Eukaryotes without cell walls Plasma membrane CYTOPLASM Animals ingest and digest food Esophagus Pharynx Crop Gizzard Intestine Anus Mouth 2/16/2011 2 Muscle and nerve cells are unique to animals Esophagus Pharynx Crop Gizzard Intestine Anus Mouth A diploid life stage dominates the animal lifecycle Key Haploid ( n ) Diploid (2 n ) Gametes n n n 2 n 2 n Zygote MEIOSIS FERTILIZATION Mitosis Diploid multicellular organism Animals undergo unique developmental stages: blastula, gastrulation Cleavage Cleavage Blastula Zygote Eight ‐ cell stage Cross section of blastula Blastocoel Gastrulation Animals undergo unique developmental stages: blastula, gastrulation Homeobox (Hox) genes regulate animal development Swalla 2006 Hox genes found Many animals have a diploid larval stage that undergoes metamorphosis Ad l 1 cm Adult Trochophore larva 100 μM 1 cm 2/16/2011 3 Which of the following could be used to distinguish animals from plants?...
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This note was uploaded on 08/09/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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01_Feb16_slides-1 - 2/16/2011 1 Introduction to Animal...

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