3.01.06 L58 - March 1, 2006 Lecture 58: Development II...

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March 1, 2006 Lecture 58: Development II Orientation & Cleavage  - cytoplasm is in the top - gray crescent is created by rotation Frog Gastrulation - Blastula is formed - Yolk on bottom - The dorsal cells divide quicker than the ventral ones - Involution:Yolk cells get pushed into the dorsal lip, creating arcenteon - Three germ layers formed during astrulation. - When finished, you have a yolk plug Cleavage of Frog v. Urchin - Urchin: cleavage in urchin develops relatively equal size - Frogs: because frogs have more yolk, their division isn’t as equal and some cells are clearly  larger tha others.  - Chicken: Everything divides on top of a massive nutrient blob. Incomplete cleavage that  eventually creates a ridge - Fruit Fly: Do chromosomal division, but no cytokinesis. Syncytial – Multinucleated cell Frog Organogenesis - gastrula formation |  gastrulation   organogenesis - Ectoderm begins to fold in to form neural plate
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This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

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3.01.06 L58 - March 1, 2006 Lecture 58: Development II...

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