AFUA

10+ Year Member
May 18, 2006
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Pre-Dental
Would someone please be gracious to put me out of my inqusitiveness(aka misery, if studying for the DAT) by telling me what the infamous sea urchin question is? Did a search, couldn't locate it.
Thanks.
 

KHANSAHAAB

Senior Member
10+ Year Member
May 19, 2005
360
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What is the purpose of the fertilization membrane in sea urchins after fertilzation. Answer: to prevent fertilization by more than one sperm.
 

DDS:)

Senior Member
10+ Year Member
5+ Year Member
Apr 8, 2005
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Dental Student
Explainations: After sperm enters the nucleus, there's this cortical reaction, cortical granules fuse with the egg membrane, this separates the vitelline layer from the plasma membrane and prevents polyspermy.
 
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A

AFUA

10+ Year Member
May 18, 2006
15
0
Status
Pre-Dental
DDS:) said:
Explainations: After sperm enters the nucleus, there's this cortical reaction, cortical granules fuse with the egg membrane, this separates the vitelline layer from the plasma membrane and prevents polyspermy.
Thank you.
 
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