本题目来源于试卷: Continuity and Change D.7 Reproduction，类别为 IB生物学
[单选题]
What is the purpose of the cortical re0am 5s 3aisob+2 kei11 ,ouuwiwiev42whj5-e action?
A. To allow the fertilized egg to implant properly.
B. To prevent polyspermy.
C. To allow fertilization to take place.
D. To trigger oogenesis.
参考答案: B
本题详细解析:
During the cortical reaction, vesicles (cortical granules) near the membrane of the egg release enzymes that make the zona pellucida hard and prevent more than one sperm (polyspermy) from fertilizing the egg. Choice B is correct. Choices A, C and D do not describe the purpose of the cortical reactions. Choices A, C and D are incorrect.
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