Biology, 6th Edition

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Greg Steinberg AP Biology Chapter 32 Introduction to Animal Evolution A. What is an Animal? a. Definition of Animals i. Animals are multicellular, heterotrophic eukaryotes. ii. Animals must ingest their food. iii. Animals lack cell walls that protect plant and bacteria cells. Instead, structural proteins hold the cells together. iv. Nervous Tissue and Muscle Tissue are responsible for movement. v. Most animals produce sexually vi. Two haploid cells fuse to form the diploid zygote. vii. The zygote cleaves into multiple cells. The multicelled formation is called the blastula. viii. Gastrulation occurs after this, tissues are added on.
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Unformatted text preview: ix. After Gastrulation, the gastrula is formed. x. The larva is sexually undeveloped and distinct from the adult form of the animal. xi. Larva undergoes metamorphosis. xii. The animal development is regulated by control genes called Hox genes. B. Two Views of Animal Diversity i. There are 35 Phyla of animals b. Biology as an ongoing process i. Phylogenetic trees are not permanent and are an example of how Biology is an ongoing process. ii. New technologies help plot phylogenetic trees iii. The more testing a hypothesis becomes, the more credible it becomes. c....
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This document was uploaded on 03/17/2008.

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