Lecture 35 - BIOL104-04 Principles of Biology I November...

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Unformatted text preview: BIOL104-04 Principles of Biology I November 29, 2010 Lecture # 35 Ch 54 Animal Development (54.1 - 54.4) Stages of development Fertilization Cleavage Gastrulation Organogenesis Fertilization External Aquatic animals Internal Terrestrial animals Provides a non-dessicating environment Fertilization Sperm penetration & membrane fusion Egg activation Fusion of nuclei The egg has a protective coat Frog & Sea Urchin Jelly layer Vitelline envelope Mammalian egg Zona pellucida Granulosa cells Sperm penetration Leads to egg activation Blocking of additional fertilization events Egg releases cortical granules Removes sperm receptors from egg Release hyalin Hyalin attracts waters Forms the fertilization envelope Prevents polyploidy Incompatible with animal development Egg Activation Sperm & egg membranes fuse Dramatic increase in the levels of free intracellular Ca ++ Starts at point of sperm entry and flows across the egg Ca ++ acts as 2nd messenger to initiate changes in protein activity Fusion of cell nuclei restores...
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Lecture 35 - BIOL104-04 Principles of Biology I November...

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