What ratios of these three tetrads would you expect to see if two genes are link

If two genes are linked, you will see that PD > TT > NPD. PD tetrads are most common; they are produced when no crossover occurs between genes and when two-strand double crossover takes place. TT tetrads are less frequent than PD; they occur when single crossovers or three-strand double crossovers take place. NPD tetrads are least frequent; they form only when four-strand double crossover occurs.

If PD = NPD, then the two genes are unlinked. This ratio indicates that either the genes are located on different chromosomes or they are syntenic but very far apart.