Answer: Distance between genes on the same chromosome.
- A The physical size of a chromosome in base pairs
- B Distance between genes on the same chromosome
- C The total number of alleles present at a locus
- D The haploid chromosome number of the species
Correct answer: B. Distance between genes on the same chromosome
Explanation: Recombination frequency (crossover frequency) is proportional to the distance between linked genes. Used to construct genetic maps (1 cM = 1% recombination).
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.