Mitosis • 2.2b

Question 1

Define

Centrosome

Answer 1

Organelle that produces spindle fibres during nuclear division.

Question 2

List

Stages of mitosis

Answer 2

• Prophase
• Metaphase
• Anaphase
• Telophase

Question 3

Explain

Why isn’t interphase part of mitosis?

Question 4

Outline

Prophase

(Stage 1 — Setup)

Answer 4

• Chromatin condenses to form chromosomes.
• The nuclear membrane disintegrates, freeing the chromosomes inside it.
• Centrosomes? move to opposite poles in the cell, and form the meiotic spindle.

Question 5

Outline

Metaphase

(Stage 2 — Priming)

Answer 5

• Chromosomes align along the cell’s equatorial plane.

Question 6

Outline

Anaphase

(Stage 3 — Action)

Answer 6

Spindle microtubules pull the sister chromatids to opposite poles of the cell.

Now, each pole of the cell has identical chromosomes.
Additionally, the sister chromatids are now all individually chromosomes again.

Question 7

Outline

Telophase

(Stage 4 — Cleanup; opposite of prophase.)

Answer 7

• Chromosomes decondense back into chromatids.
• Two new nuclear membranes form for each daughter cell.
• The spindle microtubules disappear.

+ a cleavage furrow forms in preparation for cytokinesis.