Answer: Generates new gene combinations.
- A Increases the chromosome number
- B Keeps offspring genetically identical
- C Generates new gene combinations
- D Repairs broken spindle fibres
Correct answer: C. Generates new gene combinations
Explanation: Crossing over exchanges segments between homologous chromosomes, producing new combinations of alleles and thus genetic variation.
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.