When linked characters or genes are inherited together through two or more generations,it is called

Genes $A$ and $B$ are linked. What will be the genotypes of the offspring produced from a cross between $AB/ab$ and $ab/ab$?

The percentage of crossing over will be more if:

Which one of the following pairs is correctly matched?

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?

Drosophila has four pairs of chromosomes. How many linkage groups does it have?