Answer: Chromosomes condense and become visible.
- A Chromosome decondensation into loose chromatin
- B Nuclear envelope remaining fully intact
- C Chromosomes condense and become visible
- D Chromosomes moving toward the cell equator
Correct answer: C. Chromosomes condense and become visible
Explanation: Prophase: chromatin condenses into visible chromosomes; nuclear envelope begins to break down; spindle forms.
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.