In general, the frequency with which crossing over occurs between two linked genes depends on what?

The distance or how the genes lies far apart on the chromosome.

Explanation:

Crossing over may be defined as the process of exchange of the genetic material of the two non-sister chromatids. The process of crossing over occurs during the process of meiosis.

The frequency of the crossing over generally depends upon the distance between the genes present on the chromosome. Linked genes are present on the same chromosome.