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? 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 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 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.