1. Cell Cycle Notes: Series of events cells go through as they grow
and divide.
Interphase: period of growth that occurs
between cell divisions.

2. During cell cycle: cell prepares for division grows
divides to form 2 daughter cells - each of
which begins the cycle again

3. 1st 3 occur during Interphase:
Cell Cycle = 4 phases –
1st 3 occur during Interphase:
G1 (First Gap Phase)
S Phase
G2 (Second Gap Phase)
M Phase (mitosis)

5. use your ruler to divide one quarter into fifths

6. Now label the Phases of the Cell Cycle
G1 Phase
Now label the Phases of the Cell Cycle
S Phase
Cytokinesis
Telophase
G1, S, G2 are Interphase!!!
Anaphase
Mitosis
Metaphase
G2 Phase
Prophase
PMAT !!!

7. Cell Cycle Cell increases in size & Makes new proteins and organelles
chromosomes are copied
DNA synthesis takes place
During the cell cycle, the cell grows, replicates its DNA, and divides into two daughter cells. DNA synthesis takes place during the S phase. Cell division takes place during the M phase. G1 and G2 are gap phases.
Organelles & molecules needed for cell division made

8. Why Do Cells Divide?
Reproduction
Growth
Repair
Mitosis: nuclear division, number of chromosomes remains the same

9. Skin cells are always “falling off” of us so skin is constantly going through mitosis to replace the lost skin cells

11. Res and Blk twins: https://www.youtube.com/watch?v=JIUK2KSbvvI
What's the difference between identical and fraternal twins?
Res and Blk twins:

12. But when you look at a cell it may not be so clearly defined
Cell getting ready to come out of Interphase and move into early prophase
Chromosomes condensing in later prophase
Chromosomes “met” up in the middle during metaphase
During telophase the cell looks like a “telophone”
Sister chromatids being “ripped apart” during anaphase
You can see the “cleavage furrow” right before cytokinesis in later telophase
Most eukaryotic cells go through a regular cycle of interphase, mitosis and cytokinesis. Mitosis has four phases: Prophase, Metaphase, Anaphase and Telophase. The events shown here are typical of animal cells.
But when you look at a cell it may not be so clearly defined

13. Chromosomes (paired chromatids)
Mitosis
Section 10-2
Spindle forming
Prophase
Prophase
Chromosomes (paired chromatids)
Centromere
Most eukaryotic cells go through a regular cycle of interphase, mitosis and cytokinesis. Mitosis has four phases: Prophase, Metaphase, Anaphase and Telophase. The events shown here are typical of animal cells.
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Mitosis
Spindle
forming
Prophase
Prophase is the first and longest phase of mitosis.
The centrioles separate and take up positions on opposite sides of the nucleus.
Centromere
Chromosomes
(paired chromatids)
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15. Copyright Pearson Prentice Hall
Mitosis
Spindle
forming
The centrioles lie in a region called the centrosome.
The centrosome helps to organize the spindle, a fanlike microtubule structure that helps separate the chromosomes.
Centromere
Chromosomes
(paired chromatids)
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16. Chromatin condenses into chromosomes.
Mitosis
Spindle
forming
Chromatin condenses into chromosomes.
The centrioles separate and a spindle begins to form.
The nuclear envelope breaks down.
Centromere
Chromosomes
(paired chromatids)

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Mitosis
Metaphase
Centriole
Spindle
Centriole
Metaphase
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18. Copyright Pearson Prentice Hall
Mitosis
Centriole
Metaphase
The second phase of mitosis is metaphase.
The chromosomes line up across the center of the cell.
Microtubules connect the centromere of each chromosome to the poles of the spindle.
Spindle
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19. Individual chromosomes
Mitosis
Anaphase
Individual chromosomes
Anaphase
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20. Copyright Pearson Prentice Hall
Mitosis
Anaphase
Anaphase is the third phase of mitosis.
The sister chromatids separate into individual chromosomes.
The chromosomes continue to move until they have separated into two groups.
Individual
chromosomes
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21. Nuclear envelope reforming
Mitosis
Telophase
Nuclear envelope reforming
Telophase
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22. Copyright Pearson Prentice Hall
Mitosis
Telophase
Telophase is the fourth and final phase of mitosis.
Chromosomes gather at opposite ends of the cell and lose their distinct shape.
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23. Copyright Pearson Prentice Hall
Mitosis
A new nuclear envelope forms around each cluster of chromosomes.
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24. Copyright Pearson Prentice Hall
Cytokinesis
Cytokinesis
Cytokinesis
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25. During cytokinesis, the cytoplasm pinches in half.
Each daughter cell has an identical set of duplicate chromosomes