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- #Biology
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The occurrence of the cortical reaction aimed at preventing polyspermy is ___
Subsequent to fast block polyspermy
Preceding fast block polyspermy
Following the completion of amphimixis
Prior to the acrosomal reaction
Answers (1)
The occurrence of the cortical reaction, which is aimed at preventing polyspermy (the fertilization of an egg by multiple sperm) happens subsequent to the fast block polyspermy.
Polyspermy prevention involves multiple mechanisms to ensure that only one sperm fertilizes an egg. The fast-block polyspermy is the initial mechanism that occurs immediately upon the fusion of the sperm with the egg. It involves a rapid depolarization of the egg's membrane, which creates a temporary electrical barrier, preventing other sperm from entering.
Following the fast block polyspermy, the cortical reaction takes place. This reaction involves the release of calcium ions from cortical granules in the egg's cytoplasm. The calcium ions cause a hardening of the zona pellucida (the protective layer surrounding the egg)making it impermeable to other sperm and thereby preventing polyspermy.
Therefore, the correct answer is option 1.
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