There are elaborate mechanisms to prevent more than one sperm from fertilizing a human egg because a triploid human would not develop normally.

Question

Quizplus · Accepted Answer

When a sperm successfully fertilizes an egg, rapid chemical changes in the egg's outer layer prevent additional sperm from entering. This mechanism ensures the resulting embryo has the normal diploid number of chromosomes, as a triploid embryo (resulting from fertilization by more than one sperm) would not develop normally.

There Are Elaborate Mechanisms to Prevent More Than One Sperm