1. The problem statement, all variables and given/known data Two flies were crossed one wildtype another double mutant sepia(se) and vestigial(vg) yielding 40% wild type 40% se vg, 10% se and 10% vg. The genes show- a.Complete linkage b.Incomplete linkage c.Independent assortment d. epistasis 2. The attempt at a solution Since no. of combination of phenotypes appeared =/= 2 (there are non-parental traits so) it is not complete linkage. It is neither epistasis because two genes controlling two diffrenet phenotypes not one. It can be independent assortment or incomplete linkage. Since the question says double mutant sepia(se) and vestigial(vg) (I am getting the idea that) that it is a female and the wildtype individual (with no genotype concerned hint it) is a male. The genes are likely on X chromosome. So..... it is incomplete linkage. But I'm not sure why not independent assortment.