[Campbell Biology P.1093] What is the correct sequence of events during sea urchin fertilizat... | Practice Question
What is the correct sequence of events during sea urchin fertilization, as depicted in Figure 47.2?
A: Acrosomal reaction → Contact and fusion of membranes → Cortical reaction → Entry of sperm nucleus → Contact
B: Contact → Acrosomal reaction → Contact and fusion of membranes → Cortical reaction → Entry of sperm nucleus
C: Contact and fusion of membranes → Acrosomal reaction → Cortical reaction → Entry of sperm nucleus → Contact
D: Contact → Cortical reaction → Acrosomal reaction → Contact and fusion of membranes → Entry of sperm nucleus
Explanation
Figure 47.2 clearly illustrates the sequence of events: 1. Contact, 2. Acrosomal reaction, 3. Contact and fusion of sperm and egg membranes, 4. Cortical reaction, and 5. Entry of sperm nucleus.