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BIO311D Quiz 2 - BIOLOGY QUIZ-Differences between...

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BIOLOGY QUIZ 3/4/11 -Differences between diploblastic and triploblastic Diploblastic and triploblastic are differing assortments of germ layers that arise in animals. Some animals such as cnidarians and comb jellies have only two germ layers, ectoderm and endoderm, and can be classified as diploblastic, while most other animals have three germ layers, ectoderm, mesoderm and endoderm, and can be classified as triploblastic. -What are the different body cavities? Coelomates: only one with a true coelom, which is formed by mesoderm only, has a tissue layer lining coelom and suspending internal organs, ex: segmented worm Pseudocoelomates: body cavity is not made of only mesoderm, ex: roundworm Acoelmates: no body cavity, ex: planarians -protostome vs deuterostome Protostome: spiral and determinate cleavage formation, coelom forms when masses of mesoderm split (schizocoelous), mouth develops from blastopore Deuterostome: radial and indeterminate cleavage formation, coelom forms when archenteron folds
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