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Unformatted text preview: Chapter 47 Animal Development • Development represents processes of o Cell Differentiation Specialization of cells in structure and function o Morphogenesis Process by which animal takes shape and cells end up in right locations • Fertilization o Main functions of fertilization Haploid sperm + haploid egg = Diploid zygote Egg activation: initiates metabolic reactions in egg that t rigger development of the egg • Figure 47.3 Sea Urchin Fertilization • Fertilization o Acrosomal Reaction Acrosome discharges hydrolytic enzymes Acrosomal process binds to receptors on egg cell Gamete plasma membranes fuse Depolarized membrane blocks polyspermy o Cortical Reaction Fusion of gamete membranes causes Ca +2 release from ER Enzymes from cortical granules separate vitelline layer from plasma membrane forming fertilization envelope to further block polyspermy o Egg Activation Rise in Ca +2 causes increase in rates of • Cellular respiration • Protein synthesis Note: sperm provides no materials needed for activation...
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This note was uploaded on 08/21/2008 for the course BIOL 2108 taught by Professor Leege,gleason during the Spring '08 term at Georgia Southern University .
- Spring '08