1. Detail the events associated with fertilization in sea urchins. Include the acrosomal/cortical reactions and how polyspermy...

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Biology

1. Detail the events associated with fertilization in seaurchins. Include the acrosomal/cortical reactions and howpolyspermy is prevented.
2. Describe the body plans of animals. Include types ofsymmetry, germinal tissues, body cavities, and protostome vs.deuterostome development.

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Ans 1Four important events of fertilization in the sea urchin are 1 the acrosome reaction of the sperm 2 spermegg fusion 3 the cortical reaction of the egg and 4 the formation of the fertilization coat The acrosome reaction is triggered by contact of the sperm with the jelly coat a complex extracellular matrix surrounding the egg This causes rapid fluxes of ions fusion of the acrosome membrane with the plasma membrane and extension of the acrosomal filament The acrosome membrane inserted into thesperm plasma membrane covers the acrosomal filament and contacts the plasma membrane of the egg to initiate spermegg fusion One consequence of spermegg fusion is insertion of the sperm plasma membrane into the egg plasma membrane producing a mosaic patch The sperm components inserted persist in development and can be identified by quantitative methods after gastrulation Another consequence of spermegg See Answer

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