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View this animation of what happens to the sperm and the egg during fertilisation.

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Animation: fertilisation of egg by sperm

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Description:This animation requires the latest version of Adobe Flash Player. The egg enters the fallopian tube and starts its journey towards the uterus womb. After intercourse, it takes one to 2 hours for sperm to reach the ends of the fallopian tubes. The sperm usually meet the egg in the outer one-third of the fallopian tube. One of the millions of sperm that have been travelling towards the egg manages to penetrate it. The sperm loses its tail, leaving only the head which contains the genetic material inside the egg.

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