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Fertilization and Embryo Development. Following ovulation, the egg is capable of fertilization for only 12 to 24 hours. Contact between the egg and sperm is random. Once the egg arrives at a specific portion of the tube, called the ampullar-isthmic junction, it rests for another thirty hours. Fertilization â sperm union with the egg â occurs in this portion of the tube. The fertilized egg then begins a rapid descent to the uterus.
The egg is viable from 12-24 hours. The egg is fertilized by the sperms within 24 hours. The fertilized egg travels down the tube, sits around in there for about 3 days then heads to the uterus floating around looking for a nice cushion, finds it, and implants about five days after it heads out of the tubes. Ovulation happens once a month most of the time. babydollies Â· 9 years ago.