Animal Form and Function guide

Animal Form and Function guide - AnimalFormandFunction

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Animal Form and Function Sea Urchins (External Fertilization) Phylum echinodermata (sea star) Invertebrates but deuterostome  Embryonic development/ fertilization Blastopore (hole that indents in) Will from anus of organism Preformation (”homunculus”) until 18 th  century -> miniature infant in sperm or egg Epigenesis  Aristotle Animal emerges from formless egg At Fertilization/ Conception 1. Acrosomal reaction Hydrolytic enzyme action on egg jelly coat Fast block to polyspermy (short term) Membrane depolarization prevents multiple fertilizations 2. Cortical Reaction Release of calcium causes hardening of egg outer layer and creates a  slow block to polyspermy (long term) Egg activation Increase metabolic activity Protein synthesis and cellular respiration Fertilization envelope
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Animal Form and Function guide - AnimalFormandFunction

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