Who used the frequency of recombination as a measure of the distance between genes on a chromosome and mapped their position?

The experiment shown in the given figure has been carried out by Morgan to show the phenomenon of linkage and recombination. If in cross $I$,genes are tightly linked and in cross $II$,genes are loosely linked,then what will be the percentage of recombinants produced in cross $I$ and cross $II$ respectively?

For the physical association of genes on a chromosome,Morgan coined the term $...............$ and for the generation of non-parental gene combinations,he described the term $...............$.

Who coined the term 'linkage'?

Thomas Hunt Morgan was awarded the Nobel Prize for his work on:

The term "linkage" was coined by