1. By Andrew Stone Period: 2
Mitosis and Meiosis
By Andrew Stone
Period: 2

2. Life Science Topic
Compare sexual reproduction (offspring inherit half of their genes from each parent) with asexual reproduction (offspring is an identical copy of the parent cell).

3. What is Mitosis?
The process by which one copy of a parent cell’s DNA is copied into each of the 2 identical daughter cells.

4. How it happens?
The parent cell’s chromosomes double and then divide into each of the 2 identical daughter cells

5. Stages of Mitosis Interphase: Spends most of cell life in this phase.
Cell prepare for division in this phase.

6. Prophase chromatin condenses into chromosomes.
The nuclear envelope breaks down
spindles form at opposite ends of the cell.

7. Metaphase
the spindle fully develops and the chromosomes align at the middle of spindle fibers

8. Anaphase
In anaphase, the paired chromosomes separate and begin moving to opposite ends of the cell. Spindle fibers not connected to chromatids lengthen and elongate the cell. At the end of anaphase, each pole contains a complete set of chromosomes.

9. Telophase The cell continues to lengthen.
Nuclei begin to form at opposite ends.
The nuclear envelopes of these nuclei are formed
Nucleoli also reappear.
Chromatin fibers of chromosomes uncoil.

10. Cytokinesis
During cytokinesis, the cytoplasm of a cell is physically divided to form two daughter cells
The binding of some molecules or organelles to the chromosomes or spindle fibers ensures that each daughter cell will receive a fair share of components.

11. Mitosis Links
Mitosis and Cytokinesis
Meiosis Animation

12. What is Meiosis? Not to be confused with mitosis
The process by which the number of chromosomes is reduced by half to form sex cells (sperm and egg)

13. Why?
Sex cells have half the chromosomes that body cells have so that when the sperm and the egg combine in the zygote, the zygote will have the right number of chromosomes.

14. How?
The double in the parent cell then the parent cell divides just like in mitosis except twice to produce 4 sex cells

15. Stages of Meiosis
The stages of meiosis are similar to those of mitosis except there are extra stages for the second division and in prophase some chromosomes swap genes
The next slide shows 2 diagrams of the mechanics of meiosis and the stages of meiosis

17. Meiosis Links
Interactive activity
Meiosis Matching

18. Recommended Extra Activities
Read All about Mitosis and Meiosis by Elizabeth R. C. Cregan
Also, try one of these fun activities…

19. Paraphased By Andrew Stone
1.Newspaper article – Write an article from the point of view of a person living during the discoveries of mitosis and meiosis. Answer the “who, what, when, where and why” questions. Your article must be supported by pictures with captions.
2. Poem or song – Write an original poem or song explaining the steps of mitosis and meiosis.
3. Create a model of both mitosis and meiosis – Demonstrate the steps of mitosis and meiosis by creating a model of these processes. The model must be accurate, demonstrate knowledge, and be a creative design. It must be 3D .
4. Write a children’s storybook – Write an original story explaining the steps of mitosis and meiosis. The story must include all the parts of a story including characters, plot, dialogue, descriptions and illustrations.
5. Political cartoon – You must create a political cartoon strip showing the steps of mitosis and meiosis. The cartoon must include colored drawings and captions.
6. Animated FlipBook – You must create a flip book depicting mitosis and meiosis that will show the stages of each process when flipped. Each page must have a picture (colored), as well as a description of what is happening. At the end of the book, you must write a comparison and contrast of the two processes.
Sources: Pebble Brook High School Web Site

20. Sources Ask.About.com:Biology Encyclopedia.com Picsearch You Tube
Cells Alive
Clip Art
THE END!