A DNA helix usually does not interact with other segments of DNA, and in human cells, the different chromosomes even occupy separate areas in the nucleus called "chromosome territories". This physical separation of different chromosomes is important for the ability of DNA to function as a stable repository for information, as one of the few times chromosomes interact is in chromosomal crossover which occurs during sexual reproduction, when genetic recombination occurs. Chromosomal crossover is when two DNA helices break, swap a section and then rejoin.
a dna helix usually does not interact with other segments of dna and in human cells the different chromosomes even occupy separate areas in the nucleus called "chromosome territories" this physical separation of different chromosomes is important for the ability of dna to function as a stable repository for information as one of the few times chromosomes interact is in chromosomal crossover which occurs during sexual reproduction when genetic recombination occurs chromosomal crossover is when two dna helices break swap a section and then rejoin