Chapter 32-34: Animal Diversity Objectives 1. Define common characteristics amongst all ani 2. Animals can be characterized by “body plans” 3. Molecular data is providing new data for phyl 4. Understand life without a backbone 5. Understand life with a backbone
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Chapter 32-34: Animal Diversity Objectives 1.Define common characteristics amongst all animals 2.Animals can be characterized by “body plans” 3.Molecular.
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Chapter 32-34: Animal DiversityObjectives1. Define common characteristics amongst all animals2. Animals can be characterized by “body plans”3. Molecular data is providing new data for phylogeny4. Understand life without a backbone5. Understand life with a backbone
What does it mean to be an animal?-Animals get food by;
1. Ingesting - Differs from absorption (Fungus)2. Rely on other organism for food or are heterotrophic unlike plants
-Animals are multicellular unlike protists1. Specialized cells (nervous and muscular are not found in any other multicellular organism2. Cells are held together by proteins (mostly collagen which is only found in animals)
-Reproduction is mostly sexual with the 2n version dominating life-Development into layers - leads to organs and tissue
-Some development includes a larval stage -sexually immature stage and undergoes metamorphosis-Use of Homeoboxes or gene regulatory genes are common to all animals - many have similar DNA sequences
Body Plan: Set of morphological and developmental traits that work together as a whole.
*Research suggests gastrulation has remained unchanged for 500 million years but other aspects of body plans have changed. Symmetty Tissue
1. Asymmetry = Sponges *Specialized cells isolated from other tissues by membranes (Called Germ layers during
3. Bilateria contains organisms with bilateral symmetry, triploblastic development, most are coelomates and contain three major clades1. Lophotrochozoa2. Ecdysozoa3. Deuterostomia(Deuterostome development andincludes chordates andvertebrates)
Sponges p. 670
-Thought to have been plants
-Suspension Feeders
-Water is drawn through pores and a current provided by the flagella
-Ameobocytes take food particles to the rest of the cells
Cnidarians (Jellyfish, Coral)
-Simple diploblast radial body plan
-Polyp adheres to something
-Medusa free moving form
-Carnivores
-No brain but responds to stimuli from all directions
Lophotrochozoans
-Clade includes 18 phyla
-Most diverse animal clade (very different body plans)