Cell division

Question 1

Interphase

Answer 1

G1: Centrioles begin replicating.
S: DNA is replicated
G2: Final prep. for mitosis is completed, and centrioles finish replicating.

Question 2

Early prophase

Answer 2

• Chromatin condenses, forming barlike chromosomes.
• Two sister chromatids are held together at the centromere.
• Nucleolus dissolves

Question 3

Late prophase

Answer 3

• Nuclear membrane dissolves
• Mitotic spindle forms
• Kinetochore attaches to centromere

Question 4

Metaphase

Answer 4

• Mitotic spindle pulls
• Pulls from each end
• Still attached at the kinetochore
• Forms the metaphase plate; midline

Question 5

Anaphase

Answer 5

• Mitotic spindle continues the pull
• Centromeres split
• Chromatids become daughter chromosomes

Question 6

Telophase

Answer 6

Prophase in reverse (New nuclear envelope & nucleolus)
- Mitotic spindle dissolves
- Has 2 new nuclei

Question 7

Cytokinesis

Answer 7

• Contractile ring of actin microfilaments forms the cleavage furrow and pinches the cell apart.