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Cell Biology (cytology)

What happens when sperm meets the egg?

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August 07, 2011 7:42PM

It takes many sperm to break the outer barrier of the egg, but only one to fertilize it. When that sperm meets the egg, their genetic material (chromosomes) combine to form 46 and the fertilized egg, zygote, beings to rapidly divide into a blastocyst. After about two weeks it is called an embryo, and after eighth weeks a fetus. After about 40 weeks, it is born and is called an infant.