Chap 18 notes

Chap 18 notes - Chapter 18 KEY CONCEPTS * Fertilization...

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Chapter 18 KEY CONCEPTS * Fertilization includes contact and recognition between egg and sperm, regulated sperm entry, activation of the fertilized egg, and fusion of egg and sperm pronuclei Learning Objective 4 * Describe fertilization in echinoderms * Sea stars and sea urchins * Point out some ways in which mammalian fertilization differs * Produce large number of gametes * Fertilization is external Egg Coverings * Important in fertilization – * Echinoderms * vitelline envelope and a jelly coat * Secretes a chemotactic that attracts sperm of same species * Bars interspecific fertilization * Facilitates motile sperm to find and fertilize egg * In mammals * zona pellucida - thick and noncellular * Zona is surrounded by layer of granulosa cells * Bars interspecific fertilization Acrosome Reaction * In sea urchins, facilitates penetration of egg coverings * when sperm first contacts egg, sea water Ca2+ ions move into acrosome which disorganizes * Releases proteolytic enzymes providing path through to vitelline envelope allowing
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This note was uploaded on 01/24/2012 for the course 832 335 taught by Professor Abruzzi during the Spring '10 term at Rutgers.

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Chap 18 notes - Chapter 18 KEY CONCEPTS * Fertilization...

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