Mitosis

The Cell Cycle Continued -
The Stages of Mitosis

By David Fink

Open Ended

Use the I² format to analyze the model of the mitosis stages. Provide at least 3 "I see..." - "It means..." statements.

Open Ended

Refer to Model 1. List the four phases in the mitosis process.

Open Ended

Where is mitosis in the cell cycle?

Multiple Choice

What are the X-shaped objects in the first stage of mitosis?

• replicated chromosome

• nuclear membrane

• cytoplasm

• spindle fiber

Multiple Choice

How many sister chromatids are present in a single replicated chromosome?

• 1

• 2

• 4

• 8

Multiple Choice

How many replicated chromosomes are in the original cell shown in Model 1 during prophase?

• 1

• 2

• 4

• 8

Multiple Choice

How many single chromosomes are in each of the new cells in telophase?

• 1

• 2

• 4

• 8

Open Ended

Explain what a chromosome is and why it is important.

Open Ended

Refer to the cells in telophase in Model 1.

Describe what might be the content of the new cells in telophase if replication of chromosomes did not occur before cytokinesis.

Multiple Choice

Refer to the cells in telophase in Model 1.

If DNA replication had not occurred, would both daughter cells be able to survive and reproduce?

• Yes

• No

Open Ended

In yesterday’s lesson, you saw that the S phase of interphase is where DNA is made in the nucleus of the cell. Based on Model 1, why is it important for the cell to make more DNA at this time in the cell cycle?

Multiple Choice

Refer to Model 1.

In which phase of mitosis do you see the spindle fibers forming?

• Telophase
• Anaphase
• Metaphase
• Prophase

Multiple Choice

Refer to Model 1.

At what phase of mitosis do the replicated chromosomes (sister chromatids) separate?

• Telophase
• Anaphase
• Metaphase
• Prophase

Multiple Choice

Refer to Model 1.

At what phase of mitosis do the replicated chromosomes (sister chromatids) separate?

• Telophase
• Anaphase
• Metaphase
• Prophase

Open Ended

Refer to Model 1.

Look at metaphase and anaphase. Propose the purpose of the spindle fibers during mitosis.

Open Ended

Refer to Model 1.

Describe what happens to the nuclear membrane after prophase.

Open Ended

Refer to Model 1.

Explain why it is necessary that the nuclear membrane disintegrates during mitosis.

Multiple Choice

Refer to Model 1.

At what point during mitosis has the nuclear membrane reformed?

• Telophase
• Anaphase
• Metaphase
• Prophase

Multiple Choice

What is actually dividing during cytokinesis?

• the cytoplasm

• the nucleus

• the chromosomes

• the spindle fibers

Open Ended

Cellular division has two parts – mitosis is the division of the nucleus and cytokinesis is the division of the cell into two new cells. Explain why mitosis has to come before cytokinesis in the cell cycle.

Open Ended

During cytokinesis the chromosomes unwind and become a pile of very long, thin, thread-like DNA and the cell goes back to looking “normal” until mitosis begins again. Propose why the DNA must coil up into chromosome structures before it divides.

Open Ended

In some cells, after mitosis, cytokinesis fails to occur. What would the resulting cell look like? (What properties would it have?)

Open Ended

In your own words, briefly describe what occurs during PROPHASE.

Open Ended

In your own words, briefly describe what occurs during METAPHASE.

Open Ended

In your own words, briefly describe what occurs during ANAPHASE.

Open Ended

In your own words, briefly describe what occurs during TELOPHASE.

Open Ended

In your own words, briefly describe what occurs during CYTOKINESIS.