1. Materials Agenda Notebook Pen/Pencil Packet Cell Book-76
01/20/2015- NO GUM PLEASE!
Materials Agenda Notebook Pen/Pencil Packet Cell Book-76
Agenda
Daily question
Mitosis PPT
Notes
Brain pop
Objective: Today we will learn about the cell cycle and the process of mitosis
Daily Question: What are some reasons organisms use cell division?

2. The Cell Cycle
Cell division occurs in three stages: interphase, mitosis, and cytokinesis.
Cell Division & Mitosis. Retrieved March 6, 2007, from Biology 4A Student Resources Web site:

3. Cell Division Classification
Stage
Name
Process 1
Interphase
Cell doubles in size; DNA replicates 2
Mitosis
Cell division goes through 4 phases
Mitosis begins; nuclear membrane disappears
Prophase i.
Chromosomes line up along the equator of the cell
Metaphase
ii.
Chromatids split and are pulled to each pole of cell
Anaphase
iii.
Nuclear membrane reforms; cell begins to pinch together
Telophase
iv.
Parent cell’s cytoplasm divides, forming 2 identical daughter cell 3
Cytokinesis

4. Interphase occurs before mitosis begins
Chromosomes are copied (# doubles)
Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANE
Nucleus
Cytoplasm

5. Interphase occurs just before Mitosis begins:
DNA is replicated along with organelles and other cellular components and the cell prepares for division.

6. Interphase Plant Cell Animal Cell
Photographs from:

7. Prophase 1st step in Mitosis
Mitosis begins (cell begins to divide)
Centrioles (or poles) appear and begin to move to opposite end of the cell.
Spindle fibers form between the poles.
Centrioles
Sister chromatids
Spindle fibers

8. Metaphase 2nd step in Mitosis
Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers

9. Metaphase Plant Cell Animal Cell
Photographs from:

10. Anaphase 3rd step in Mitosis
Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers

11. Anaphase Plant Cell Animal Cell
Photographs from:

12. Telophase 4th step in Mitosis
Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods).
Mitosis ends.
Nuclei
Nuclei
Chromatin

13. Telophase Plant Cell Animal Cell
Photographs from:

14. Cytokinesis occurs after mitosis
Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

15. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

16. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

17. IPMATC REMEMBER! Interphase Prophase Metaphase Anaphase Telophase
Cytokinesis
IPMATC
A mnemonic to help remember the stages of mitosis.
I Play More At The Courts

18. Cell Cycle

19. - Cell Division
The Cell Cycle 19

20. Mitosis Animation

21. Mitosis & Meiosis
Mitosis animation:

22. Mitosis:
If a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome).
The copies then must be separated & sorted into two sides of the cell.
The cell then splits in two. Part of each parent is carried to the two new cells.
Results in cells such as internal organs, skin, bones, blood, etc.

23. Meiosis:
As in mitosis, if a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome).
Results in reproductive cells (sperm, eggs, etc).
Part of each parent is carried to the four new cells.
Meiosis has evolved to solve a problem.
The problem is this: some organisms have sex with other organisms – that is, they combine their genes together (creating genetic diversity).
Why would this be a problem?

24. This may you remember these terms:
MITosis takes the cell and Makes It Two (diploid)
Meiosis has to do with sex
From the cell’s point of view:
mITosis results in Identical Twins
mEioSis results in Egg and Sperm (haploid)
Clyde Freeman Herreid – Dept. of Biological Sciences: Buffalo State Univ. of New York

25. Each resulting cell still has chromosomes from mom & dad
Mitosis: Meiosis:
Explain the randomness in meiosis
End of first class
Each resulting cell still has chromosomes from mom & dad

26. Mitosis Mitosis animations:
Beginning of second class

28. Meiosis Interphase
Meiosis is preceded by interphase. The chromosomes have not yet condensed.

29. Meiosis Interphase
The chromosomes have replicated, and the chromatin begins to condense.

30. Meiosis Prophase I
The chromosomes are completely condensed. In meiosis (unlike mitosis), the homologous chromosomes pair with one another

31. Meiosis Metaphase I
The nuclear membrane dissolves and the homologous chromosomes attach to the spindle fibers. They are preparing to go to opposite poles.

32. Meiosis Anaphase I The chromosomes move to opposite ends of the cell.

33. Meiosis Telophase I & Cytokinesis
The cell begins to divide into two daughter cells. It is important to understand that each daughter cell can get any combination of maternal and paternal chromosomes.

34. Meiosis Prophase II The cell has divided into two daughter cells.

35. Meiosis Metaphase II
As in Meiosis I, the chromosomes line up on the spindle fibers.

36. Meiosis Anaphase II
The two cells each begin to divide. As in Meiosis I, the chromosomes move to opposite ends of each cell.

37. Telophase II & Cytokinesis
With the formation of four cells, meiosis is over. Each of these prospective germ cells carries half the number of chromosomes of somatic cells.

38. Crime Scene-photo Lab
Photo log each photo-description
Partner photographs scene on i-phone
Go over each photo to ensure accuracy