It start like this for the first time, an easy thing ;), If a sperm cell meets and penetrates an egg, it will fertilize the egg. The fertilization process takes about 24 hours.
When fertilization happens, changes occur on the surface of the egg to prevent other sperm from penetrating it. At the moment of fertilization, the genetic makeup is complete, including the sex of the infant.
Sunday, April 27, 2008
Pregnancy: The First Episode
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