Invertebrates powerpoint

Apr 8th, 2015
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This is the best powerpoint written about invertebrates and describes everything about them.

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Invertebrate AnimalsCellular organizationNo backboneMulticellular- lack a cell wallDo not have lungs, respirate through skinMost have tissues- which are specific organization of cellsReproduce sexuallyHeterotrophic- they cant make their own foodEach animal Phylum has a uniquebody plan Each animal Phylum has a unique body plan This is due to the differences in expression of the Hox genesgenes tell embyronic cells which body part to become, themutations in Hox genes lead to the vast diversity of animalspecies.How are invertebrates grouped? 3 Criteria are used to group/categorize: Body plan symmetry Tissue layers Developmental patternsTypes of Body Plan Symmetry Bilateral Symmetry: Body divides equally along one plane. Have three distinct layers of tissue Ectoderm(Outer layer) Mesoderm (Middle layer) Endoderm (Inner layer)Other types of Body Plans Body is arranged in a circle around a central axis(usually themouth) Have two layers Ectoderm (Outer layer) Ectoderm (Inner layer) Asymmetry: Body is irregular in shape.Developmental Patterns As a zygote the organism: consists of unrealizedgenomic potential operates using stored materials has relationships with no other cells consists of one cell of only one type Early Development includes: development of new raw materials for building embryo establishing new relationships bet

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