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Sci 9 Lesson 4 Mar 1 and 2 - Ch 5.2 Asexual Reproduction
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Sci 9 Lesson 4 Mar 1 and 2 - Ch 5.2 Asexual Reproduction


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BC Science 9 …

BC Science 9
Ch. 5.2 Asexual Reproduction
pp. 166-178

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  • 1. Homework from last class:
    • Complete the Onion Root Lab Activity and The Cell Cycle and Cancer worksheet
    • Read notes on Cancer on the class blog (in this slideshow)
    • Keep working on your Mitotic Movies project
    • Read over class notes and check out the class blog: http:// /
  • 2. Ch 5.1 Review
    • Who can tell me…
    • 1) What are the phases of mitosis?
    • prophase, metaphase, anaphase, telophase
    • 2) What do the nucleus and chromosomes look like during prophase?
      • - Nucleolus disappears, nuclear membrane begins to break down.
      • - Chromosomes become visible and they attach themselves to spindle fibers at the centromeres.
      • 3) How does cytokinesis differ in plant and animal cells?
      • animal cell: cell membrane pinches together and the cell divides
      • plant cell: cell plate forms to make new cell wall and cell membrane
  • 3. Ch 5.1 Review
    • Who can tell me…
    • 4) What is the importance of checkpoints in the cell cycle?
    • - At these checkpoints, the cell can be stopped from growing or dividing if conditions are unsuitable.
    • - Important for survival of the organism.
    • What may happen if the checkpoint proteins no longer function?
    • If a mutation occurs in a gene producing the instructions for the checkpoint protein, then cell cycle control will be lost  could lead to cancer.
  • 4. Asexual Reproduction Chapter 5.2 pp. 166-178
  • 5. Asexual Reproduction
    • What is asexual reproduction?
    • asexual reproduction: reproduction that requires only one parent and produces offspring that are genetic copies of the parent
  • 6. Asexual Reproduction
    • A clone is an identical genetic copy of its parent.
    • Many organisms naturally form clones via asexual reproduction.
    • Cloning is also used in agriculture and research to copy desired organisms, tissues and genes.
      • Examples?
        • Animals (sheep, pigs, cattle, horses)
        • Plants (ornamental shrubs, trees)
        • Livestock breeds and plant production
        • Skin cells (grow new tissue for burn victims)
        • Healthy genes (replace mutated ones)
    Dolly the sheep – the world’s first cloned animal
  • 7. Activity time! Types of Asexual Reproduction
  • 8. Activity Instructions:
    • I will make 6 groups – each group will research a particular kind of asexual reproduction: (starts on p. 168)
    • Binary Fission
    • Budding
    • Fragmentation
    • Vegetative Reproduction
    • Benefits of Vegetative Reproduction
    • Spore Formation
    • 15 minutes to summarize your assigned type of asexual reproduction – use the information in the textbook.
    • Each group member must choose a role:
    • writer, encourager, discussion leader, questioner, conflict negotiator
  • 9. Activity Instructions:
    • Write your summary on the transparency and present your information to the class.
    • You will complete a self-evaluation and will receive a teacher evaluation for your group effort and accuracy.
    • You will be quizzed on this material after the activity so pay attention!!!
  • 10. Types of Asexual Reproduction
  • 11. Binary Fission – p. 168-169
    • Binary fission : single parent cell organism splitting into 2 identical copies
    • Binary fission is the only method of reproduction for some types of bacteria.
      • Since bacteria do not have a nucleus, they do not undergo mitosis ; however, the one ring of DNA does replicate
      • In favourable environmental conditions, bacteria can reproduce every 20 minutes!
  • 12. Budding – p. 170
    • Budding - areas of multicellular organisms undergo repeated mitosis and cell division to form an identical organism.
    • Buds sometimes detach to form a separate organism.
      • Example: Hydra, sponges, and yeast
    Budding yeast cells
  • 13. Fragmentation – p. 170 - 171
    • Fragmentation - part of an organism breaks off due to injury , and the part grows into a clone of the parent
      • Examples:
      • Sea star - if an arm detaches, it can develop into another sea star
      • Plants - aquatic weeds (e.g. Eurasian milfoil)
    Sea Star Regeneration video:
  • 14. Vegetative Reproduction – p. 172
    • Vegetative reproduction - special cells in plants (usually in stems or roots) that develop into structures that form new plants identical to the parent
      • Examples: Tulip, daffodil, hyacinth bulbs, potatoes, strawberries
      • Main disadvantage: new plants grow very close together  competition for resources (soil, nutrients, light)
  • 15. Vegetative Reproduction – p. 172
      • Main benefits: Can allow crop harvest (e.g. potatoes), can make cuttings and grafts of house plants
      • In grafting , parts of a desirable plant are removed and attached to a rooted stock of another plant
    p. 174
  • 16. Spore Formation – p. 174
    • Spore formation - some bacteria, micro-organisms and fungi can form spores - single reproductive cells that can grow into a whole new organism by mitosis
    • Light weight - can be carried by wind or water
    • Can grow in suitable environment (enough moisture, temperature, and food)
    • Have tough outer coating to allow them to survive harsh conditions
    • Examples: bread mold, mosses, ferns
  • 17. Advantages and Disadvantages: Asexual Reproduction Table 5.1 p. 175
  • 18. Homework for next class:
    • Answer Reading Check Questions 1-5 p. 178
    • Study for Quiz on Asexual Reproduction
    • Keep working on your Mitotic Movies project - due March 8 for Science 9 (1-1) and March 9 for Science 9 (2-4)
    • Read over class notes and check out the class blog: http:// /
  • 19. Works Cited
    • Images taken from the following sources:
    • http:// /help/yeast-reproduction-budding