Lec25+2011 - Required reading Chapter 47: pp. 1021-1044...

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Unformatted text preview: Required reading Chapter 47: pp. 1021-1044 Recommended exercises Self Quiz Ch 47: 1, 3 Web/CD activity 47A, B Lecture 25: Vertebrate Development I Monday Nov. 21, 2011 Bio 93, O Dowd and Warrior, UCI - Copyright: All rights reserved 1. __ Fertilization __- fusion of sperm and egg nuclei and egg activation 2. Cleavage- rapid cell division without growth in size to generate a multicellular embryo 3. Gastrulation- mass cell movements to form three germ layers 4. Organogenesis- localized changes in tissue and cell shape Stages in embryonic development Bio 93, O Dowd and Warrior, UCI - Copyright: All rights reserved Stage 1. Fertilization The main function is to bring haploid nuclei of sperm and egg together to form a diploid zygote. There are 2 problems that could be disastrous to fertilization i. Fertilization by _sperm from other species________ ii. Fertilization by more than one sperm________ Bio 93, O Dowd and Warrior, UCI - Copyright: All rights reserved Stage 1. Fertilization These problems are solved by two processes: Acrosomal Reaction- necessary for sperm penetration....
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Lec25+2011 - Required reading Chapter 47: pp. 1021-1044...

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