1. Copy and complete the following chart in your composition book.
Word
Know it well
Have heard/seen it
No clue
1. interphase
2. mitosis
3. cytokinesis
4. sythesis
5. chromosome
6. centromere
7. chromotid
8. centriole
9. spindle fibers

2. Mitosis and the Cell Cycle
Big Idea:
Mitosis is the process in which the nucleus divides to form two new nuclei and two cells with identical DNA.
Mrs. Camp
7th Grade Life Science 2

3. How do little elephants grow up
to be BIG elephants?

4. Why do animals shed their skin?

5. Notes on Cell cycle (Green slides are to be copied in composition book)
All cells have a cycle: birth, growth & development, and then death.
Cells do not take the same amount of time to go through the cycle. (for example: every few seconds a few billion red blood cells are developed. However, skin cells take approximately 21 days.)

6. Phases of the Cell Cycle
The cell cycle consists of
Interphase – normal cell activity
Mitosis – cell division
Cytokinesis – cell splits
Copy &
label the
diagram
INTERPHASE
(DNA synthesis)
Growth
G 1
Growth G2
Cell Divsion
Mitosis
Cytokinesis

7. Have them copy what’s in yellow not all of the examples.
Why do cells make more cells? Three reasons why cells reproduce by asexual reproduction:
20 µm
100 µm
200 µm
(1) Reproduction. An amoeba, a single-celled eukaryote, is dividing into two cells. Each new cell will be an individual organism (LM).
(2) Growth and development. This micrograph shows a sand dollar embryo shortly after the fertilized egg divided, forming two cells (LM).
(3) Repair and replacement. These dividing bone marrow cells (arrow) will give rise to new blood cells (LM).
Have them copy what’s in yellow not all of the examples.

8. Stages of the Cell Cycle (Blue slides are for the foldable)
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis }
Mitosis

9. Interphase occurs before mitosis begins
3 stages (G1, S phase, G2) G means gap
90% of the time is spent in Interphase
Heredity material is copied and prepares for division
Centrioles
CELL MEMBRANE
Nucleus
Cytoplasm

10. Interphase
G1 phase – before S phase, growth occurs, organelles are copied, & normal metabolic roles continue
S phase – DNA synthesis, chromosomes are duplicated
G2 phase – growth and prepares for Mitosis.

11. Interphase INTERPHASE ANIMATION
Plant Cell
Animal Cell
Photographs from:

12. Mitosis
Definition – the process in which the nucleus divides to form 2 identical nuclei
2nd stage in cell cycle
Has 4 phases (prophase, metaphase, anaphase, and telophase)

13. Prophase (P…pairs) Mitosis (M1)
Centrioles (or poles) appear and begin to move to opposite end of the cell.
Spindle fibers form between the poles.
Chromatids condense to form a double rod-shape aka chromosome
Centrioles
Sister chromatids
Spindle fibers

14. Prophase PROPHASE ANIMATION
Plant Cell
Animal Cell
Spindle fibers
Centrioles
Photographs from:

15. Chromosome Structure
Copy and label the diagrams

16. Metaphase (M…middle)
Mitosis (M2)
Pairs of chromosomes (or chromatids) attach to the spindle fibers and line up along the middle.
Centrioles
Spindle fibers
chromosomes

17. Metaphase METAPHASE ANIMATION 2
Plant Cell
Animal Cell
Photographs from:

18. Anaphase (A…apart)
Mitosis (M3)
Chromatids (or pairs of chromosomes) are pulled apart by the spindle fibers and pulled towards the poles.
Spindle fibers
chromatids
Centrioles

19. Anaphase ANAPHASE ANIMATION
Plant Cell
Animal Cell
Photographs from:

20. Telophase (T…two) Mitosis (M4)
Chromosomes reach the opposite sides of the cell & begin to unravel.
New membrane forms around each set of chromosomes & now…Two new nuclei
Mitosis ends.
Centrioles
Spindle fibers

21. Telophase TELOPHASE ANIMATION
Plant Cell
Animal Cell
Photographs from:

22. CYTOKINESIS Animation
occurs after Mitosis
CYTOKINESIS Animation
3rd stage of Cell Cycle
Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes

23. Cytokinesis
Cell furrow – place on animal cell that separation occurs…membrane pinches apart
Cell plate - place on a plant cell that separation occurs…breaks apart
Cyto means cell
Kinesis means movement
Now, starts all over again & those 2 cells will become 4, those 4 become 8…

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

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

26. IPMATC REMEMBER! Interphase Prophase Metaphase Anaphase Telophase
Cytokinesis
IPMATC
A mnemonic to help remember the stages of mitosis.
Interesting People Make A Terrific Conversation

27. Mitosis Animation

28. 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