Mitosis and the Cell Cycle Worksheet featuring a matching exercise and diagrams of cell cycle phases.

Worksheet: Mitosis and the Cell Cycle

#### Question 1: Matching Terms to Descriptions
In this section, we need to match the terms related to the cell cycle (Anaphase, Interphase, Metaphase, Prophase, Telophase) to the given descriptions. Each term may be used more than once.

#### Descriptions and Matches:

1. The centromere is broken and the sister chromatids are separating.
- Term: Anaphase

2. The nuclear envelope can no longer be seen.
- Term: Prophase or Metaphase (Both phases involve the breakdown of the nuclear envelope.)

3. Cytoplasm is being divided between the daughter cells.
- Term: Telophase

4. The period of growth and development between mitotic divisions.
- Term: Interphase

5. A cell plate is forming in the dividing cell.
- Term: Telophase

6. DNA replication is occurring.
- Term: Interphase (S phase)

7. A nuclear membrane forms around two sets of chromosomes.
- Term: Telophase

8. The chromosomes, which had been visible, now seem to become invisible.
- Term: Interphase (G1 or G2 phase)

9. The chromosomes have aligned at the equator of the cell.
- Term: Metaphase

10. A cleavage furrow can be observed in the dividing cell.
- Term: Telophase

11. The stage that occurs before cytokinesis.
- Term: Telophase

12. Chromatin is condensing to form chromosomes.
- Term: Prophase

13. The stage in which the cell is not actively dividing.
- Term: Interphase

14. Spindle fibre is forming in the dividing cell.
- Term: Prophase

#### Completed Table:

| TERM | DESCRIPTION |
|------------|-----------------------------------------------------------------------------|
| Anaphase | The centromere is broken and the sister chromatids are separating. |
| Prophase | The nuclear envelope can no longer be seen. |
| Prophase | Chromatin is condensing to form chromosomes. |
| Prophase | Spindle fibre is forming in the dividing cell. |
| Metaphase | The chromosomes have aligned at the equator of the cell. |
| Interphase | The period of growth and development between mitotic divisions. |
| Interphase | DNA replication is occurring. |
| Interphase | The stage in which the cell is not actively dividing. |
| Telophase | Cytoplasm is being divided between the daughter cells. |
| Telophase | A cell plate is forming in the dividing cell. |
| Telophase | A nuclear membrane forms around two sets of chromosomes. |
| Telophase | A cleavage furrow can be observed in the dividing cell. |
| Telophase | The stage that occurs before cytokinesis. |

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#### Question 2: Identifying Phases of the Cell Cycle
The diagrams show different stages of the cell cycle. We need to identify each phase based on the visual characteristics.

##### Diagrams and Phases:

- Diagram A:
- Characteristics: Chromosomes are condensed and aligned at the metaphase plate.
- Phase: Metaphase

- Diagram B:
- Characteristics: Sister chromatids are separating, and the cell is beginning to divide.
- Phase: Anaphase

- Diagram C:
- Characteristics: Cleavage furrow is forming, indicating the division of the cytoplasm.
- Phase: Telophase/Cytokinesis

- Diagram D:
- Characteristics: Nuclear envelope is intact, and chromosomes are not visible (chromatin state).
- Phase: Interphase (G1 or G2 phase)

- Diagram E:
- Characteristics: Chromosomes are aligned at the metaphase plate.
- Phase: Metaphase

- Diagram F:
- Characteristics: Chromosomes are condensing, and the nuclear envelope is breaking down.
- Phase: Prophase

##### Final Identification:

- A: Metaphase
- B: Anaphase
- C: Telophase/Cytokinesis
- D: Interphase
- E: Metaphase
- F: Prophase

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Final Answer:

#### Question 1:
| TERM | DESCRIPTION |
|------------|-----------------------------------------------------------------------------|
| Anaphase | The centromere is broken and the sister chromatids are separating. |
| Prophase | The nuclear envelope can no longer be seen. |
| Prophase | Chromatin is condensing to form chromosomes. |
| Prophase | Spindle fibre is forming in the dividing cell. |
| Metaphase | The chromosomes have aligned at the equator of the cell. |
| Interphase | The period of growth and development between mitotic divisions. |
| Interphase | DNA replication is occurring. |
| Interphase | The stage in which the cell is not actively dividing. |
| Telophase | Cytoplasm is being divided between the daughter cells. |
| Telophase | A cell plate is forming in the dividing cell. |
| Telophase | A nuclear membrane forms around two sets of chromosomes. |
| Telophase | A cleavage furrow can be observed in the dividing cell. |
| Telophase | The stage that occurs before cytokinesis. |

#### Question 2:
- A: Metaphase
- B: Anaphase
- C: Telophase/Cytokinesis
- D: Interphase
- E: Metaphase
- F: Prophase

Boxed Final Answer:
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\text{See detailed explanations above.}
}
\]