Mitosis vs meiosis worksheet | PDF - Free Printable

Based on the analysis of the provided image, here are the solutions to questions 10 through 15.

Question 10: Describe the differences in how the chromosomes line up in middle of the cell during Metaphase I of Meiosis and Metaphase of Mitosis.

* Metaphase of Mitosis: In mitosis, individual chromosomes (each consisting of two sister chromatids) line up single file along the metaphase plate (the equator of the cell). The alignment is independent for each chromosome.
* Metaphase I of Meiosis: In meiosis I, homologous chromosome pairs (tetrads, or bivalents) line up along the metaphase plate. These pairs align as units, not as individual chromosomes. The orientation of each pair is random relative to the poles, which is the basis for independent assortment.

Question 11: Identify the phase in the cell to the left. What is the name of Structure A?

* Phase: The cell labeled 'A' shows chromosomes aligned at the equator of the cell. This is characteristic of Metaphase.
* Structure A: Structure A is pointing to one of the condensed chromosomes lined up at the metaphase plate. Therefore, the name of Structure A is a chromosome.

Question 12: Identify the phase in the cells to the left. What is happening to the nuclear envelope? Why does this happen?

* Phase: The two cells shown display condensed chromosomes that are scattered throughout the cell, and the nuclear envelope is no longer visible as a distinct boundary. This is characteristic of Prophase.
* What is happening to the nuclear envelope? The nuclear envelope is breaking down (or disintegrating).
* Why does this happen? The nuclear envelope breaks down to allow the spindle fibers, which form from the centrosomes at opposite poles, to access and attach to the kinetochores on the chromosomes. This attachment is necessary for the subsequent movement and separation of chromosomes.

Question 13: Identify the phase in the cell to the left. What is being separated?

* Phase: The cell shows chromosomes being pulled apart towards opposite poles of the cell. The sister chromatids have separated and are now moving as individual chromosomes. This is characteristic of Anaphase.
* What is being separated? Sister chromatids are being separated.

Question 14: Explain why mitosis is referred to as a process of cell replication.

Mitosis is referred to as a process of cell replication because its primary function is to produce two genetically identical daughter cells from a single parent cell. It ensures that each new cell receives an exact copy of the parent cell's chromosomes. This process is essential for growth, tissue repair, and asexual reproduction, where the goal is to create copies of the original cell.

Question 15: Explain why meiosis is referred to as a process of cell reduction.

Meiosis is referred to as a process of cell reduction because it reduces the number of chromosomes in a cell by half. It starts with a diploid (2n) parent cell and, through two successive divisions (Meiosis I and Meiosis II), produces four haploid (n) daughter cells (gametes). This reduction is crucial for sexual reproduction, as it ensures that when two gametes fuse during fertilization, the resulting zygote has the correct diploid number of chromosomes, maintaining the species' chromosome count across generations.