Fertilization- Latest
Fertilization is the process by which a sperm from a male meets an ovum from a female and forms a zygote, which is the point at which pregnancy begins and leads to a 280-day journey for a female. Fertilization is a complex multi-step process that is complete in 24 hours.
During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine wall — a process called implantation.
The sperm must penetrate the corona radiata and zona pellucida of the egg to fertilize it. Once the sperm has penetrated the ovum, immediate changes take place not to allow further penetration of the ovum. These exact changes are in the biochemical section of this article. The function of fertilization is to create a diploid (2N) zygote.
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