Questions: Chapter 9 Homework Mitosis (2 of 3): Mechanism of Mitosis (BioFlix tutorial) Mitosis unfolds through a sequence of stages marked by specific events in the cell. The structural changes in the cell are brought about by a series of t Sort each process into the appropriate bin to indicate the stage of mitosis in which it occurs. If a process occurs in more than one stage, sort Kinetochores Cohesins Microtubules Cohesins join sister Kinetochores move toward attach to are motionless Spindle chromatids of in relation microtubules Tubulins assemble poles of cell. break down. kinetochores. duplicated chromosome. to poles of cell. into spindle disassemble. microtubules. prophase prometaphase metaphase anaphase telophase

To sort the processes into the appropriate stages of mitosis, we need to understand the key events that occur in each stage:

1. Prophase:

   • Chromosomes condense and become visible.
   • The mitotic spindle begins to form.
   • The nuclear envelope starts to break down.

2. Prometaphase:

   • The nuclear envelope is completely broken down.
   • Microtubules attach to kinetochores on the chromosomes.
   • Chromosomes begin to move toward the center of the cell.

3. Metaphase:

   • Chromosomes are aligned at the metaphase plate (the cell's equatorial plane).
   • Kinetochores are motionless in relation to the poles of the cell.

4. Anaphase:

   • Cohesins are cleaved, allowing sister chromatids to separate.
   • Kinetochores move toward the poles of the cell as the chromatids are pulled apart.
   • Microtubules shorten, pulling chromatids toward opposite poles.

5. Telophase:

   • Chromatids reach the poles of the cell.
   • The nuclear envelope re-forms around each set of chromosomes.
   • The spindle apparatus disassembles.

Now, let's sort the processes:

• Cohesins join sister chromatids of duplicated chromosome: This occurs during prophase and is maintained until anaphase when they are cleaved.

• Kinetochores attach to microtubules: This occurs during prometaphase.

• Kinetochores are motionless in relation to poles of cell: This occurs during metaphase.

• Tubulins assemble into spindle microtubules: This begins in prophase and continues into prometaphase.

• Cohesins break down: This occurs during anaphase.

• Kinetochores move toward poles of cell: This occurs during anaphase.

• Spindle microtubules disassemble: This occurs during telophase.

In summary, each process is sorted into the stage of mitosis where it primarily occurs, based on the structural changes and events characteristic of each stage.