1. The Cell Cycle and Mitosis
Mr. Meringolo

2. The Cell Cycle
The cell cycle is divided into three stages: interphase, mitosis, and cytokinesis.
During the cell cycle, a parent cell divides into two cells. The new cells are identical to the parent cell.

3. Why do cells divide?
Reproduction –Cell division is important for asexual reproduction, which involves only one parent organism. Sexual reproduction involves two parents. In single-celled organisms, the parent cell divides into two identical offspring. Growth and Repair- One characteristic of all livings things is growth. Most growth occurs in organisms happens because cell division produces new cells.

4. What happens to genetic material during cell division?
DNA- The genetic material in cells that contains the information that determines the traits that a living thing inherits.
DNA contains the instructions for an organisms growth, development, and activities.
Chromatin- A complex material consisting of DNA and proteins
Chromatid- Two identical structures that develop after a chromosome duplicates.
Centromere- Holds the chromatids together.

5. Mitosis
Mitosis- The part of the cell cycle during which the nucleus divides
Prokaryotes do not undergo mitosis because they do not have a nucleus
Mitosis results in two identical nuclei that are identical to the original nucleus
At the end of Mitosis, the cell has two identical sets of chromosomes intwo separate nuclei.
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7th Grade Life Science 5

6. The Phases of Mitosis Interphase Prophase Metaphase Anaphase
Telophase & Cytokinesis

7. Interphase occurs before mitosis begins
The part of the cell cycle during which the cell is not dividing
During Interphase, the cell grows to about twice the size it was when it was first produced and produces various organelles.
Changes that occur during interphase prepare a cell for division.
DNA is duplicated during interphase
CELL MEMBRANE
Nucleus
Cytoplasm

8. Interphase Animal Cell Plant Cell
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9. Prophase 1st step in Mitosis
Mitosis begins (cell begins to divide)
During prophase, the chromatin in the nucleus of a cell condenses and becomes visible and the membrane around the nucleus begins to break down.

10. Prophase Plant Cell Animal Cell Spindle fibers Centrioles
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11. Metaphase 2nd step in Mitosis
During Metaphase, chromosomes line up in the middle of the cell. The Centromeres of the chromosomes are the same distance from each side of the cell.

12. Metaphase Animal Cell Plant Cell
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13. Anaphase 3rd step in Mitosis
During Anaphase, the chromatids separate and they are pulled to opposite sides of the cell. Each side of the cell ends up with a complete set of chromosomes.

14. Anaphase Animal Cell Plant Cell
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15. Telophase 4th step in Mitosis (Last Phase)
The last phase of mitosis
A new nuclear membrane forms around each group of chromosomes and the cell has two identical nuclei.
Chromosomes become less condensed
Cytokinesis begins during this phase

16. Telophase
Animal Cell
Plant Cell

17. Cytokinesis occurs after Mitosis
Cytokinesis- the division of the parent cell’s cytoplasm. Occurs when the cell membrane pinches inward towards the new nuclei until two complete cells are formed.
Begins during the last step of mitosis

18. IPMATC REMEMBER! Interphase Prophase Metaphase Anaphase Telophase
Cytokinesis
IPMATC
A mnemonic to help remember the stages of mitosis.
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19. Cell Cycle