Describe the mechanisms evolved by eggs to prevent polyspermy.

Polyspermy is the fertilization of an egg by more than one sperm, which leads to an abnormal number of chromosomes and typically results in developmental failure. Vertebrates have evolved several mechanisms to prevent polyspermy, ensuring that only one sperm fertilizes the egg. These mechanisms can be categorized into fast block and slow block methods, which act in a sequential manner to ensure that no additional sperm can enter the egg after the initial fertilization.

Fast Block to Polyspermy

The fast block to polyspermy is an immediate response that prevents additional sperm from fusing with the egg membrane. This process ____ _________ _____ ________ _________ __________ __________ _______ ________.
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