Can an egg be fertilized more than once?
No, an egg can only be fertilized once.
Here's why:
* The Zona Pellucida: The egg is surrounded by a protective layer called the zona pellucida. When a sperm penetrates the egg, it triggers a chemical change in the zona pellucida, making it impenetrable to other sperm. This prevents multiple sperm from fertilizing the egg.
* Genetic Material: The moment a sperm fertilizes an egg, the egg's nucleus fuses with the sperm's nucleus. This combines the genetic material from both parents, forming a single, complete set of chromosomes. Any additional sperm would introduce extra chromosomes, leading to an unviable embryo.
Therefore, a single sperm fertilizing an egg is essential for a healthy pregnancy to occur.
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