Practice question

Genes separated by fifty centimorgans or more experience frequent crossover events along interval including single and double exchanges that randomise chromatid combinations so parental and recombinant gametes appear equally frequent indistinguishable from independent assortment. Genetic map distance measured in centimorgans equals one percent recombination over short intervals but beyond fifty becomes non-additive without mapping function correction like Haldane or Kosambi. Hence genetically distant loci behave as unlinked even though physically on same chromosome showing fifty percent recombinant progeny and independent segregation in test crosses.