Solved Class/Period Date Name Contrasting Mitosis and | Chegg.com - Free Printable

Problem Description:

The task involves drawing the chromosomes in a cell as it undergoes Mitosis and Meiosis. The worksheet provides blank circles for each stage, and the goal is to illustrate the changes in chromosome behavior during these processes.

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Solution Explanation:

#### Part I: Mitosis
Mitosis is the process of cell division that results in two genetically identical daughter cells. It consists of five stages: Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis (not explicitly shown here). Below is the explanation for each stage:

1. Prophase:
- Chromosomes condense and become visible.
- The nuclear envelope breaks down.
- Centrioles move to opposite poles of the cell.
- Draw the chromosomes as tightly coiled structures, with sister chromatids still attached at the centromere.

2. Metaphase:
- Chromosomes align at the metaphase plate (equatorial plane) of the cell.
- Spindle fibers attach to the kinetochores of the chromosomes.
- Draw the chromosomes aligned in the center of the cell, with spindle fibers connecting them to the poles.

3. Anaphase:
- Sister chromatids separate and are pulled toward opposite poles by the spindle fibers.
- Each chromatid becomes a full chromosome.
- Draw the chromosomes moving toward opposite poles of the cell.

4. Telophase:
- Chromosomes reach the poles and begin to decondense.
- Nuclear envelopes reform around the sets of chromosomes.
- Spindle fibers disassemble.
- Draw the chromosomes at the poles, with new nuclear envelopes forming around them.

5. Daughter Cells:
- The cell divides into two identical daughter cells.
- Each daughter cell receives an exact copy of the parent cell's DNA.
- Draw two separate cells, each containing a complete set of chromosomes.

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#### Part II: Meiosis
Meiosis is a specialized type of cell division that reduces the chromosome number by half, resulting in four haploid daughter cells. It consists of two sequential divisions: Meiosis I and Meiosis II. Below is the explanation for each stage:

1. Prophase I:
- Chromosomes condense and become visible.
- Homologous chromosomes pair up (synapsis), forming tetrads.
- Crossing-over may occur between non-sister chromatids.
- Draw homologous chromosomes paired together, showing crossing-over if applicable.

2. Metaphase I:
- Tetrads align at the metaphase plate.
- Spindle fibers attach to the kinetochores of the homologous chromosomes.
- Draw the tetrads aligned at the center of the cell.

3. Anaphase I:
- Homologous chromosomes separate and are pulled toward opposite poles.
- Sister chromatids remain attached at the centromere.
- Draw the homologous chromosomes moving toward opposite poles.

4. Telophase I:
- Chromosomes reach the poles.
- Nuclear envelopes may reform, or the cell may proceed directly to Meiosis II.
- Draw chromosomes at the poles, with possible reformation of nuclear envelopes.

5. Prophase II:
- If nuclear envelopes reformed in Telophase I, they break down again.
- Spindle fibers form anew.
- Draw chromosomes condensing, similar to Prophase in Mitosis.

6. Metaphase II:
- Chromosomes align at the metaphase plate.
- Spindle fibers attach to the kinetochores.
- Draw chromosomes aligned at the center of the cell.

7. Anaphase II:
- Sister chromatids separate and are pulled toward opposite poles.
- Draw sister chromatids moving toward opposite poles.

8. Telophase II:
- Chromosomes reach the poles and begin to decondense.
- Nuclear envelopes reform.
- Draw chromosomes at the poles, with new nuclear envelopes forming around them.

9. Daughter Cells:
- The cell divides twice, resulting in four haploid daughter cells.
- Each daughter cell contains half the number of chromosomes as the original parent cell.
- Draw four separate cells, each with a unique combination of chromosomes due to crossing-over and independent assortment.

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Final Answer:

- Mitosis: Draw the chromosomes progressing through the stages of Prophase, Metaphase, Anaphase, and Telophase, ending with two identical daughter cells.
- Meiosis: Draw the chromosomes undergoing Meiosis I (Prophase I, Metaphase I, Anaphase I, Telophase I) and Meiosis II (Prophase II, Metaphase II, Anaphase II, Telophase II), ending with four haploid daughter cells.

Final Answer:
\[
\boxed{\text{Draw the chromosomes according to the explanations above for each stage of Mitosis and Meiosis.}}
\]