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Fertilization. Computer artwork of a group of human sperm (spermatozoa) approaching an egg (ovum). Only one sperm will penetrate the egg's thick outer layer (zona pellucida) and fertilize it. Fertilization occurs when DNA (deoxyribo- nucleic acid) released by the sperm fuses with DNA contained in the egg. Women produce a single egg at a time, whilst men release around 500 million sperm. The sperm use their flexible tails to travel through the female reproductive tract. Only a few thousand sperm reach the egg, which is located in one of the Fallopian tubes.
May 6th, 2013
Viewed 15 Times - Last Visitor from New York, NY on 07/08/2014 at 3:55 PM
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