Question
Only one sperm enters an egg becausea. sperm have an acrosome.b. the corona radiata gets larger.c. changes occur in the zona pellucida.d. the cytoplasm hardens.e. All of these are correct.
Step 1
The sperm has a structure called an acrosome which helps it to penetrate the outer layers of the egg. However, this is not the reason why only one sperm enters the egg. Show more…
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Only one sperm enters and fertilizes a human ovum because a. sperm have an acrosome. b. the corona radiata gets larger. c. the zona pellucida lifts up. d. a fertilization membrane forms. e. All of these are correct.
Once a sperm fuses with an ovum, the remaining sperms cannot fertilize ovum. What changes are responsible for such phenomenon? (a) Sclective permcation through ovum. (b) Specific spatial arrangement of corona radiata cells. (c) Change in the membrane zona pellucida. (d) Ovum releases toxic substances thereby killing other sperms.
The sperm comes into contact with the layer of ovum to cause fertilization. (a) Corona radiata (b) Perivitelline layer (c) Zona pellucida (d) Zona fasciculata
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