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.
Today’s Schedule
1. Observing the Sky
2. How Does New Life Begin? Part 1
3. Asexual Reproduction Activity
Look at the Sky on your way to school!
How does new life begin?
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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.
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
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)
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.
• Today’s Schedule: 1. Review Asexual
Reproduction 2. Finish Notes 3. Assignment
Types of Asexual Reproduction
• 1. Binary fission- cell reproduction by division
(the cell splits to form 2 new, identical cells)
• binary fission
• animation
Types of Asexual Reproduction
• 2. budding- new organism grows from the body
of the parent organism
• ARKive - Brown hydra video -
Types of Asexual Reproduction
• 3. regeneration- whole organism develops
from a piece of another organism
•
Planaria: A window on regeneration.
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
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.
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.
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.
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.
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.
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.