Asexual reprod


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Types of asexual reproduction

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Asexual reprod

  1. 1. How do cells make new cells? <ul><li>Do You know: </li></ul><ul><li>What happens when you cut a worm in half? </li></ul><ul><li>Why do you think you can grow new skin over a cut on you hand but you can’t grow new fingers? </li></ul>
  2. 2. What is reproduction? <ul><li>Reproduction is the process by which </li></ul><ul><li>organisms produce more of their own kind. </li></ul><ul><li>Think about it – Without reproduction, all life on earth would no longer exist. </li></ul>
  3. 3. What is Asexual Reproduction? <ul><li>Only one parent is involved. </li></ul><ul><li>Offspring are genetically identical to their parents. </li></ul><ul><li>Creates no genetic variation. </li></ul><ul><li>All cells that come from a single cell are genetically identical to it and to each other; they are all clones . </li></ul>
  4. 4. <ul><li>Mitosis - is the exact duplication of the nucleus of a cell so as to form two identical nuclei during cell division. </li></ul><ul><li>It occurs in somatic cells (body cells). Function is for growth and repair of tissue. </li></ul>Types of Division during Asexual Reproduction
  5. 5. Parent divides to form two new daughter cells
  6. 6. <ul><li>Binary Fission – </li></ul><ul><li>Many, but not all, single-celled organisms (unicellular), such as bacteria , and protists , reproduce asexually through binary fission . </li></ul>Types of division during Asexual Reproduction
  7. 7. <ul><li>Such Protists include, amoeba’s and paramecium. </li></ul><ul><li>The nucleus divides by binary fission and the cytoplasm divides, forming 2 new cells of equal size. </li></ul>Binary Fission
  8. 8. Amoebas reproduce asexually by binary fission . A parent cell divides (the nucleus also divides in a process called fission) and produces two identical copies of itself.
  9. 9. Bacteria dividing by binary fission
  10. 10. Types of Asexual Reproduction <ul><li>Budding </li></ul><ul><li>Some cells split via budding (for example baker's yeast), </li></ul><ul><ul><li>The buds grow into fully matured individuals which eventually break away from the parent animal </li></ul></ul>
  11. 11. <ul><li>Seen Mostly in Marine Animals and Yeast </li></ul><ul><ul><li>Examples Include; Sponges, Corals and Jellyfish… </li></ul></ul>
  12. 13. Some starfish can reproduce sexually and asexually. The starfish below has legs that are uneven because they have broken off in the process of asexual reproduction.
  13. 14. YouTube - Sea Star Regeneration <ul><li>Watch the video clip to see starfish regeneration. </li></ul><ul><li>This shows 2 new limbs starting to bud. </li></ul><ul><li>The old limbs that fell off will regenerate into 2 new starfish genetically identical to the parent. </li></ul>
  14. 15. Budding in Hydra
  15. 16. The video link below will show a hydra in the process of budding. YouTube - Hydra
  16. 17. <ul><li>Vegetative Propagation – </li></ul><ul><li>found in plants where new independent individuals are formed without the production of seeds or spores </li></ul><ul><li>Example – fragmentation, where small fragments of the plant develop into a new plant </li></ul>Types of Asexual Reproduction
  17. 19. Iris Rhizomes (roots) can be cut and a new plant will grow.
  18. 20. Spider plants send out runners that can cut be planted. The new plant is a clone of the parent . <ul><ul><ul><ul><ul><li>Adult Plant Detached Runners </li></ul></ul></ul></ul></ul>