BS 110 Notes 11-5-2010

BS 110 Notes 11-5-2010 - BS 110 Notes 11-5-2010 Chapters...

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BS 110 Notes 11-5-2010 Chapters 29, 30, 34, 32, 33, 34 on the test 8. Echinodermata – spiny skin – starfish, sand dollars, sea urchins, sea cucumbers a. Dioecious, coelomate, complete digestive tract b. Larvae have bilateral symmetry c. Pentaradial symmetry (calcium plates) d. Internal skeleton e. Water vascular system with tube feet – tubes and channels filled with water and the tube feet are extensions of these tubes and channels Based on early embryological development Two Major Groups: 1. Protostomes a. Egg cleavage is determinate and spiral i. If cells of early embryological development are separated, each one can only form a partial embryo ii. Spiral - The plane of cell division is oblique to the longitudinal axis of the embryo and the newly formed cells have a spiral pattern b. Mouth arises from/next to blastopore (first opening of embryo) 2. Dueterostomes a. Egg cleavage is indeterminate and radial i. Each cell can produce a complete embryo ii. Radial – plane of cell division is at right angles/ parallel to the longitudinal axis
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This note was uploaded on 01/31/2011 for the course BS 110 taught by Professor S.lawrence during the Fall '07 term at Michigan State University.

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BS 110 Notes 11-5-2010 - BS 110 Notes 11-5-2010 Chapters...

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