Answer: Restore the diploid number at fertilisation.
- A Double the chromosome number each generation
- B Restore the diploid number at fertilisation
- C Prevent all genetic variation
- D Undergo further meiosis at once
Correct answer: B. Restore the diploid number at fertilisation
Explanation: Because gametes are haploid, their fusion at fertilisation restores the diploid number, keeping it constant across generations.
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.