1-29-08 notes

1-29-08 notes - Biology Animals What is an animal...

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Biology January 29, 2008 Animals What is an animal? Eukaryotic Multicellular o Extracellular proteins o Intracellular junctions o Specialized cell types Heterotrophic—don’t make their own carbon. Ingest other organisms that make carbon No cell wall Early development characteristics o Blastula and gastrula stages unique to animals Genetics of animal development o Conserved over time o Hox genes History of animals Common ancestor of animals: 1.2 billion years ago o Sponge-like protist called a choanoflagellate o Modern choanoflagellate Found in aquatic habitats Neoproterozoic (1 billion to 542 million) o Ediacaran fauna o Cnidarians and soft-bodied mollusks Paleozoic (542 to 251 million)
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o Cambrian EXPLOSION! Half of all phyla CQ: What are likely hypotheses for the diversification of animal life during the “Cambrian explosion”? A) Predator-prey relationships stimulated animal radiation B) Changing sea levels increased available land for animal habitat
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1-29-08 notes - Biology Animals What is an animal...

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