Practice question

Genetic map unit introduced by Sturtevant measuring recombination percentage one percent equals one map unit later renamed centimorgan honouring Thomas Hunt Morgan so both terms synonymous describing same recombination-based distance. Kilobase and base pair quantify physical DNA length, nanometer measures size scale, but centimorgan captures meiotic exchange probability not physical length. Maps built from such units order genes additively for short intervals requiring Haldane or Kosambi functions for longer intervals where multiple crossovers obscure true recombination count and underestimate distance significantly if uncorrected.