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Exam%202%20review - Sea Urchin Fertilization How does the...

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DEVELOPMENTAL BIOLOGY, Eighth Edition , Figure 7.4 Figure 7.6 Vitelline envelope Plasma Membrane Sea Urchin Fertilization • How does the sperm penetrate all the way through the egg to get to the nucleus? Signal transduction events occur both outside and inside the plasma membrane Structure of sea urchin egg at fertilization Scanning electron microscope of sea urchin oocyte
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DEVELOPMENTAL BIOLOGY, Eighth Edition , Figure 7.8 Sea Urchin Fertilization: events that occur outside the plasma membrane 1) Sperm contacts jelly layer 2) Acrosomal vesicles in the sperm head get released 3) Sperm enzymes (proteases) digest the egg jelly coat 5) Acrosome fuses with egg plasma membrane 4) Sperm penetrates to the vitelline envelope
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Sea Urchin Fertilization: events that occur inside the plasma membrane 1) Cortical granules positioned just below plasmid membrane of egg cell 2) Binding of sperm triggers cortical granules to spill their contents out of plasma membrane * this is due to Ca 2+ influx 3) Vitelline envelope expands cortical granules contain proteases which cut protein anchors 4) Fertilization envelope forms and prevents polyspermy DEVELOPMENTAL BIOLOGY, Eighth Edition , Figure 7.19
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Exam%202%20review - Sea Urchin Fertilization How does the...

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