describe how crossing over can be used to measure the relative distances between linked loci

Dear student,
If the loci for the two genes are very close, crossing over is unlikely to separate alleles, whereas if they are far apart, crossing over is much more likely to separate them. Therefore, the frequency of crossing over is related to the physical distance between the loci for the two genes
Using map locations to track down genes to clone their DNA by chromosome position.  Fruit fly theory, Huntington's disease,
Regards,