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17 Asexual Reproduction


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17 Asexual Reproduction

  1. 1. Asexual Reproduction
  2. 2. Reproduction without sex <ul><li>Binary fission in prokaryotic microbes </li></ul><ul><li>Mitosis in the somatic cells of eukaryotes </li></ul><ul><li>Spore formation in fungi </li></ul><ul><li>Natural cloning in animals </li></ul><ul><ul><li>Budding in sponges and corals </li></ul></ul><ul><ul><li>‘ virgin births’ in insects </li></ul></ul><ul><li>Vegetative reproduction in plants (eg. runners, cuttings and rhizomes) </li></ul>
  3. 3. Binary fission in bacteria <ul><li>Much faster than mitosis in eukaryotic cells </li></ul><ul><li>Takes approx. 20 mins as opposed to several hours </li></ul><ul><li>If resources were available once cell could become 16,000,000 in 8 hours! </li></ul>
  4. 4. Binary Fission in bacteria
  5. 5. Binary Fission in bacteria
  6. 6. Binary Fission in bacteria
  7. 7. Binary Fission in bacteria
  8. 8. Binary Fission in bacteria
  9. 9. Binary fission in bacteria <ul><li>Bidirectional replication of circular DNA </li></ul><ul><li>DNA moves to poles </li></ul><ul><li>Cell elongates </li></ul><ul><li>Cleavage furrow forms </li></ul><ul><li>Cell divides </li></ul>
  10. 10. Asexual reproduction in plants Parent Bud Runner Rhizome New frond