Identify the Phases of the Cell Worksheet for 7th Grade | Lesson ... - Free Printable

The task involves identifying the phases of mitosis in a provided diagram and matching them with their descriptions. Below is a detailed explanation of how to solve this problem:

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Step 1: Understand the Phases of Mitosis

Mitosis is the process of cell division that results in two genetically identical daughter cells. It consists of five main phases:
1. Prophase: Chromosomes condense, the nuclear envelope breaks down, and the mitotic spindle begins to form.
2. Prometaphase: Chromosomes attach to the spindle fibers via their kinetochores, and the nuclear envelope fully disintegrates.
3. Metaphase: Chromosomes align at the metaphase plate (equatorial plane) of the cell.
4. Anaphase: Sister chromatids separate and are pulled toward opposite poles of the cell by the spindle fibers.
5. Telophase: Chromosomes reach the poles, decondense, and new nuclear envelopes form around each set of chromosomes.

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Step 2: Analyze the Diagram

The provided diagram shows different stages of mitosis. Each phase is represented by a labeled box. The goal is to match these boxes with the correct phase names and descriptions.

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Step 3: Match the Phases with Descriptions

Here is the breakdown of each phase based on the descriptions provided:

#### Phase 1: Prophase
- Description: "Chromosomes become visible as rod-shaped structures."
- Explanation: During prophase, chromatin condenses into distinct, rod-shaped chromosomes. The nuclear envelope begins to break down, and the mitotic spindle starts forming.

#### Phase 2: Prometaphase
- Description: "Nuclear envelope breaks down completely, and chromosomes attach to spindle fibers."
- Explanation: In prometaphase, the nuclear envelope disintegrates entirely, and chromosomes attach to the spindle fibers via their kinetochores.

#### Phase 3: Metaphase
- Description: "Chromosomes line up along the equator of the cell."
- Explanation: During metaphase, all chromosomes align at the metaphase plate (the equatorial plane) of the cell, preparing for separation.

#### Phase 4: Anaphase
- Description: "Sister chromatids separate and move toward opposite poles."
- Explanation: In anaphase, the sister chromatids are pulled apart by the spindle fibers and move toward opposite poles of the cell.

#### Phase 5: Telophase
- Description: "New nuclear envelopes form around each set of chromosomes."
- Explanation: During telophase, the chromosomes reach the poles, decondense, and new nuclear envelopes form around each set of chromosomes. The cell then prepares for cytokinesis.

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Step 4: Assign Labels to the Diagram

Using the descriptions and explanations above, assign the correct labels to the boxes in the diagram. Ensure that the visual characteristics of each phase (e.g., chromosome alignment, presence of a nuclear envelope, etc.) match the corresponding description.

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Final Answer

Based on the descriptions and the visual cues in the diagram, the phases should be labeled as follows:

1. Prophase: Chromosomes condense and the nuclear envelope begins to break down.
2. Prometaphase: Nuclear envelope breaks down completely, and chromosomes attach to spindle fibers.
3. Metaphase: Chromosomes align at the metaphase plate.
4. Anaphase: Sister chromatids separate and move toward opposite poles.
5. Telophase: New nuclear envelopes form around each set of chromosomes.

Thus, the final answer is:

\boxed{\text{Prophase, Prometaphase, Metaphase, Anaphase, Telophase}}