Normally,only one sperm can fertilize an egg because
A)The first sperm to fuse with the oocyte plasma membrane triggers a process whereby enzymes begin to inactivate other nearby sperm
B)The first sperm to fuse with the oocyte plasma membrane triggers a process whereby the zona pellucida becomes impenetrable to other sperm
C)Only one sperm normally makes it to the vicinity of the egg
D)Only one sperm undergoes the acrosome reaction
E)Only one sperm undergoes capacitation

Question

Quizplus · Accepted Answer

The correct answer is B because once a sperm fuses with the oocyte plasma membrane, it triggers a reaction that makes the zona pellucida (a glycoprotein layer surrounding the egg) impenetrable to other sperm. This is known as the zona reaction and ensures that only one sperm can fertilize the egg. However, it is worth noting that in rare cases, multiple sperm can penetrate the egg resulting in abnormal development.

Normally,only One Sperm Can Fertilize an Egg Because