Biology Notes 3-12-08

Biology Notes 3-12-08 - Biology Notes March 12, 2008...

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Biology Notes March 12, 2008 Caveats: Radial Cleavage – ancestral condition, found in diploblastic animals, some protostomes, and most deuterostomes. Spiral Cleavage – derived condition in eumetazoa, found in lophotrochozoans. Some other developmental features: Fate of cells determine in most protostomes, indeterminate in deuterstomes. Distinct layers of cells form in early development: Diploblastic – animals have two cell layers, ectoderm and endoderm. Triploblastic – have three cell layers – ectoderm, mesoderm and endoderm In many animals, gastrulation results in a hollow ball one cell thick, with an indent. Opening to the cavity formed by the indent is the blastopore. In triploblastic animals, there are two patterns of development after this point. How animal bodies are arranged: Body plan: the general structure, arrangement of the organ systems and integrated functioning of the parts. Four key features:
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This note was uploaded on 05/02/2008 for the course BIOL 102 taught by Professor Hill/smith during the Spring '08 term at Idaho State University.

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Biology Notes 3-12-08 - Biology Notes March 12, 2008...

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