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Fertilization and Early Embryonic Development

  • Page ID
    184692
  • The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.Part A is a micrograph that shows a sperm whose head is touching the surface of an egg. The egg is much larger than the sperm. Part B is an illustration that shows the surface of the egg, which is coated with a zona pellucida. The sperm penetrates the zona pellucida and releases its DNA into the egg. At this point, changes in proteins just inside the egg’s cell membrane occur, preventing entry of other sperm.(a) Fertilization is the process in which sperm and egg fuse to form a zygote. (b) Acrosomal reactions help the sperm degrade the glycoprotein matrix protecting the egg and allow the sperm to transfer its nucleus. (credit: (b) modification of work by Mariana Ruiz Villareal; scale-bar data from Matt Russell)

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