Answer: Cytokinesis (cleavage furrow formation).
- A Chromosome condensation during prophase
- B Spindle assembly during prometaphase
- C Cytokinesis (cleavage furrow formation)
- D DNA replication during S phase
Correct answer: C. Cytokinesis (cleavage furrow formation)
Explanation: Actin and myosin form the contractile ring in animal cell cytokinesis. The ring contracts to form the cleavage furrow.
The cell cycle: G1 (growth and preparation), S (DNA replication, chromosome number stays 2n but DNA content doubles), G2 (final checks before division), and M (mitosis itself) - together, G1+S+G2 make up interphase.
Concept context
Mitosis and meiosis: how cells divide for growth, repair, and reproduction.