After the fertilization of a sea urchin egg, the influx of which ion prevents polyspermy?Multiple choice question.SodiumChlorideCalciumPotassium
Question
After the fertilization of a sea urchin egg, the influx of which ion prevents polyspermy?
- Sodium
- Chloride
- Calcium
- Potassium
Solution
Analyzing the Question
- Understanding Polyspermy: Polyspermy refers to the fertilization of an egg by more than one sperm cell, which can result in abnormal development.
- Role of Ions in Sea Urchin Fertilization: Upon fertilization, specific ions play a crucial role in preventing polyspermy.
Relevant Concepts
- Calcium Ions (Ca²⁺): In sea urchins, the influx of calcium ions is a key mechanism in the fertilization process.
- Cortical Reaction: The release of calcium ions triggers the cortical granule exocytosis, leading to changes in the egg membrane and formation of a fertilization envelope.
Conclusion
Based on the role of ions in the fertilization of a sea urchin egg, the influx of Calcium ions is what prevents polyspermy.
Final Answer
Calcium is the ion that prevents polyspermy after the fertilization of a sea urchin egg.
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