Biology · Developmental Biology
During fertilization in mammals, which event most directly ensures the prevention of polyspermy while simultaneously contributing to egg activation?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Completion of the acrosomal reaction in the sperm head
- 2Cortical granule exocytosis causing the zona reaction✓
- 3Fast electrical block due to rapid Na+ influx across the membrane
- 4Binding of the sperm to the zona pellucida protein ZP3
Correct answer
Cortical granule exocytosis causing the zona reaction
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