Fertilization occurs when a sperm cell from a male merges with an egg cell from a female, typically within the female's reproductive tract. This process usually involves the sperm traveling through the female's reproductive system to reach the egg, which is released during ovulation. Upon successful penetration of the egg's outer layer by a sperm, their genetic materials combine to form a zygote, initiating the development of a new organism. Fertilization can occur through sexual intercourse or assisted reproductive technologies, such as in vitro fertilization.
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