Answer: Four.
- A Two
- B Three
- C Four
- D Eight
Correct answer: C. Four
Explanation: A bivalent is a pair of homologous chromosomes; since each chromosome has two sister chromatids, the bivalent (tetrad) contains four chromatids.
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.