Ch 31 Material

Ch 31 Material - CHAPTER 32 INTRODUCTION TO ANIMAL...

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1 CHAPTER 32 INTRODUCTION TO ANIMAL DIVERSITY Rise of Heterotrophic, multicellular animals Table 26.1 What are Animals? 5 Characteristics of Animals Multicellular, heterotrophic eukaryotes, with tissues developing from embryonic layers No cell walls Nervous and muscle tissues Sexual reproduction , diploid dominant Hox genes
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2 Intercellular Junctions Nervous Tissue Muscle Tissue Gastrulation Some animals develop directly and gradually into adults, but others have distinct larval stages . Rana catesbeiana (Bullfrog) Special regulatory genes that control the transformation of a zygote to a specific animal 5. Animals have Hox Genes Do all animals share a common ancestor? Choanoflagellate
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3 A modern choanoflagellate colony 0.02 mm high Phylum Choanozoa Evolution of Multicellularity The Origins of Animal Phyla “The Cambrian Explosion” The Neoproterozoic Era (1 billion-542 mya) The Ediacaran Period The Paleozoic Era (542-251 mya) “The Cambrian Explosion” C A M B R I A N Ecological Causes Geological Causes Genetic Causes What sparked the Cambrian Explosion?
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This note was uploaded on 04/02/2008 for the course BIOL 112 taught by Professor Vaughn during the Spring '08 term at Texas A&M.

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Ch 31 Material - CHAPTER 32 INTRODUCTION TO ANIMAL...

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