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The Endowment for Human Development
The Endowment for Human Development
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Cell Division


48 hours

From The Biology of Prenatal Development.Buy Now

Script: Approximately 24 to 30 hours after fertilization, the zygote completes its first cell division. Through the process of mitosis, one cell splits into two, two into four, and so on.

All ages referenced to fertilization, not last menstrual period.
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Fertilization 1
Fertilization 1
Fertilization 2
Fertilization 2
Cell Division
Cell Division
The Morula and Blastocyst
The Morula and Blastocyst
3 Billion Base Pairs per Cell
3 Billion Base Pairs per Cell
Amnion and Germ Layers
Amnion and Germ Layers
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