To solve this problem, we need to understand the genetic concept of linkage and recombination.$\newline$In a testcross involving F$_1$ dihybrid flies, the observation of more parental-type offspring than recombinant-type offspring suggests a specific genetic relationship between the genes.$\newline \bullet$Parental-type offspring are those that inherit the same combination of traits as the parents, while recombinant-type offspring have new combinations of traits.$\newline \bullet$If the two genes were located on different chromosomes, we would expect an equal number of parental and recombinant offspring due to independent assortment. This corresponds to Option 1, which is incorrect.