Welcome to Science 1/31

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Welcome to Science 1/31

• On your paper write down your own definition
  for Reproduction. Then make a list of all the
  ways you think organisms can reproduce.
• Todays Schedule
• 1. Observing the Sky
• 2. How Does New Life Begin? Part 1
• 3. Asexual Reproduction Activity

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Look at the Sky on your way to school!
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How does new life begin?

• What are all living things made of?
• 1. all living things are made of cells
• 2. new life can only come from living organisms
• Therefore, new life can only come by making new
  cells.

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How do we get new cells?

• Cells are alive. Therefore, cells have a life
  cycle
• Mitosis (cell division)- process by which the
  nucleus divides to form two identical nuclei
• Animation Mitosis

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What are the results of mitosis?

• 1. two cells that are exactly the same have been
  made.
• 2. asexual reproduction- new organisms are
  produced from one parent and are genetically
  identical (clones)

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Welcome to Science 2/3

• On your paper take the Types of Asexual
  Reproduction Pop Quiz Match each picture with
  the correct type of asexual reproduction.
• 1. 2.
  3.
• Todays Schedule 1. Review Asexual Reproduction
  2. Finish Notes 3. Assignment

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Types of Asexual Reproduction

• 1. Binary fission- cell reproduction by division
  (the cell splits to form 2 new, identical cells)
• binary fission
• animation

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Types of Asexual Reproduction

• 2. budding- new organism grows from the body of
  the parent organism
• ARKive - Brown hydra video -

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Types of Asexual Reproduction

• 3. regeneration- whole organism develops from a
  piece of another organism
• Planaria A window on regeneration.

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Types of Asexual Reproduction

• 4. parthenogenisis- eggs produced by a female
  develop without ever being fertilized by a male.
• (some fish, frogs, lizards, and insects reproduce
  this way) Evolution Library Asexual Reproducers
• more videos

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Asexual Reproduction in Plants

• 5. Stems Above ground or underground stems are
  the most common example asexual reproduction in
  plants.
• 6. Roots Many plants and trees are send out
  shoots or suckers directly from the roots.

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Results of Asexual Reproduction

• Remember that organisms that have been asexually
  reproduced are exactly the same as their parents.
• They are affected by the environment in the exact
  same way.

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Asexual Reproduction Activity

• 1.You received 3 pieces of candy.
• 2. The red white mints represent planarian, a
  type of flat worm.
• 3. The green white mints represent euglena, a
  single celled organism.
• 4. The butterscotch represents amoeba, a single
  celled organism.

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Asexual Reproduction Activity

• 5. All 3 organisms reproduce asexually.
• 6. All 3 organisms live in a river next to a
  factory.
• 7. For several years the factory has been dumping
  waste into the river. Scientists who have been
  studying the stream have noticed that the
  population of amoebas and euglena have been
  drastically reduced yet the planarian population
  is thriving.
• 8. If you are a euglena or amoeba, eat your candy
  because you are dead.

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Asexual Reproduction Activity

• 9. If you are a planarian why did you survive and
  the other organisms die?
• 10. The amoebas and euglenas must have been
  vulnerable to the waste that was being dumped in
  the river. Because you all are exactly the same
  you all were killed. The planarian must have been
  immune to the waste, and therefore was not
  affected by it. Because all of the planarian are
  the same none of them died.

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The Big Picture

• Asexual reproduction limits the spread of
  different characteristics through a species and
  only allows for genetic continuity.
• This can be good or bad for the organism. It all
  depends on the environment.