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How do Organisms Reproduce? textbook pages 127 - 139. Mr. Jeff Peterson Fulbright Teacher from Indiana, USA. Why Reproduce?. Necessary to maintain life… Respiratory System Digestive System Nervous System Immune System Excretory System

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how do organisms reproduce textbook pages 127 139

How do Organisms Reproduce?textbook pages 127 - 139

Mr. Jeff Peterson

Fulbright Teacher from Indiana, USA

why reproduce
Why Reproduce?
  • Necessary to maintain life…
    • Respiratory System
    • Digestive System
    • NervousSystem
    • Immune System
    • Excretory System
  • Why reproduce when it is not necessary to maintain life?
reproduction
Reproduction
  • Class IX review:
    • Nucleus contain DNA
    • DNA is used to make proteins
    • Sequence of DNA are chromosomes
    • Chromosomes = genetic information
reproduction1
Reproduction
  • Class IX review:
    • Amino acids (A-T, C-G)= Letters
    • Genes (traits) = Words
    • Chromosomes = Sentences
    • DNA = Pages or Instructions
reproduction2
Reproduction
  • Reproduction is the creation of a DNA copy
  • Genetic photocopy…
  • Genetic variation is also important…
reproduction3
Reproduction
  • Role of variation
  • Variation is the raw material of natural or artificial selection
  • Earth is a dynamic ecosystem
reproduction5
Reproduction
  • Variation ensures life/species will go on
reproduction6
Reproduction
  • Conflict then is maintaining high variation while ensuring a good copy of the DNA
    • Classic example = Peppered Moth
reproduction7
Reproduction
  • Reproduction (Asexual)
    • Fission (single celled organisms)
      • Binary and Multiple
    • Fragmentation (simple multicellular organisms)
    • Regeneration (simple multicellular organisms)
    • Budding (simple multicellular organisms)
    • Vegetative Propagation (plants)
    • Spore Formation (single/multicellular organisms)
reproduction8
Reproduction
  • Vegetative Propagation
    • Asexual reproduction in plants.
    • Plants can bear fruit sooner.
    • Propagation of plants that no longer seed.
      • Examples = banana, rose, jasmine…
reproduction9
Reproduction
  • Vegetative Propagation
    • Asexual reproduction in plants.
    • Example: Bryophyllum leaf with buds
reproduction10
Reproduction
  • Spore Formation
reproduction11
Reproduction
  • Spore Formation
reproduction12
Reproduction
  • Asexual vs Sexual Reproduction?
reproduction13
Reproduction
  • Asexual vs Sexual Reproduction?
  • Many organisms can reproduce sexually as well as asexually
    • Examples Sea Anemone, Star Fish
reproduction14
Reproduction
  • Asexual vs Sexual Reproduction?
  • Under good conditions?
    • abundant food supply
    • adequate shelter
    • favorable climate
    • optimum pH
    • proper mix of other lifestyle requirements
reproduction15
Reproduction
  • Asexual vs Sexual Reproduction?
  • Under poor conditions?
    • food sources have been depleted
    • the climate becomes hostile
    • individual survival is jeopardized by some other adverse change in living conditions
reproduction16
Reproduction
  • Review Questions Page 133
    • How does binary fission differ from multiple fission?
    • How will an organism be benefited if it reproduces through spores?
    • Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
    • Why is vegetative propagation practiced for growing some types of plants?
    • Why is DNA copying an essential part of the process of reproduction?