The Cell Cycle Worksheet featuring questions and illustrations of mitosis stages.

Problem Analysis:

The task involves identifying and explaining the phases of the cell cycle based on the provided diagram and worksheet. The key points to address are:

1. Identify the phase of cells A & F.
2. Determine which cell is in metaphase.

Step-by-Step Solution:

#### 1. Identify the phase of cells A & F
- Cell A: This cell shows a nucleus with visible chromosomes that are not yet aligned at the metaphase plate. The chromosomes appear to be moving toward the poles, indicating that the cell is in anaphase.
- Cell F: This cell shows a single nucleus with no visible chromosomes, suggesting that the nuclear envelope has reformed, and the cell is preparing for cytokinesis. This indicates that cell F is in telophase.

Thus, cells A & F represent anaphase and telophase, respectively.

#### 2. Determine which cell is in metaphase
- Metaphase is characterized by the alignment of chromosomes at the metaphase plate (equatorial plane) in the center of the cell. The chromosomes are attached to the spindle fibers via their kinetochores.
- In the provided diagram:
- Cell C shows chromosomes aligned at the metaphase plate, with spindle fibers attaching to the kinetochores. This is a clear indication of metaphase.

Thus, cell C is in metaphase.

Final Answers:

1. Cells A & F show an early and late stage of the same phase of the cell cycle. What phase is it?
- Anaphase (early) and Telophase (late)

2. Which cell is in metaphase?
- Cell C

Explanation:

- Anaphase is the phase where sister chromatids separate and move toward opposite poles of the cell.
- Telophase is the final phase of mitosis where the chromosomes reach the poles, the nuclear envelope reforms, and the cell prepares for cytokinesis.
- Metaphase is the phase where chromosomes align at the metaphase plate, ensuring equal distribution during cell division.

This analysis uses the visual cues from the diagram to identify the specific phases of the cell cycle.