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



BC Science 9

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



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

    • 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:// /
    • 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
    • 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.
    • Asexual Reproduction Chapter 5.2 pp. 166-178
    • Asexual Reproduction
      • What is asexual reproduction?
      • asexual reproduction: reproduction that requires only one parent and produces offspring that are genetic copies of the parent
    • 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
    • Activity time! Types of Asexual Reproduction
    • 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
    • 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!!!
    • Types of Asexual Reproduction
    • 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!
    • 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
    • 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:
    • 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)
    • 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
    • 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
    • Advantages and Disadvantages: Asexual Reproduction Table 5.1 p. 175
    • 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:// /
    • Works Cited
      • Images taken from the following sources:
      • http:// /help/yeast-reproduction-budding