There are mainly two types of linkages: complete linkage and incomplete linkage. Complete Linkage - In complete linkage, some genes do not separate from each other, due to a lack of crossing over and transferring together in the next generation. Complete linkage occurs in very few organisms such as drosophila. Incomplete Recombination - Here complete linkage does not occur, there is a linkage in some genes. The percentage of incomplete linkage is more than 25%.