Fertilization

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Fertilization

  1. 1. <ul><li>Occurs in the uterine tubes </li></ul><ul><ul><li>Within a day of ovulation </li></ul></ul><ul><li>Spermatozoa cannot fertilize an ovum until after capacitation (rearrangement of mitochondria in sperm after ejaculation, increases motility) </li></ul>Fertilization (conception)
  2. 2. Fertilization Figure 29.1a
  3. 3. Fertilization Figure 29.1b
  4. 4. <ul><li>Oocyte is in meiosis II </li></ul><ul><ul><li>Surrounded by the corona radiate </li></ul></ul><ul><li>Spermatozoa release hyaluronidase and acrosin </li></ul><ul><ul><li>Enzymes required to penetrate corona radiate </li></ul></ul><ul><li>Single spermatozoan contacts oocyte, fertilization begins </li></ul><ul><ul><li>Oocyte activation </li></ul></ul>The Oocyte at Ovulation
  5. 5. <ul><li>Oocyte completes meiosis II </li></ul><ul><ul><li>Functionally mature ovum </li></ul></ul><ul><ul><li>Female pronucleus and male pronucleus fuse (amphimixis) </li></ul></ul><ul><li>Polyspermy prevented by membrane depolarization and cortical reaction </li></ul>Oocyte activation

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