The method used to break the unfavourable linkage is

Solution (By Examveda Team)

The method used to break the unfavourable linkage is Diallele selective mating.
The concept of a diallele selective mating system was originally developed by Jensen in 1970. He used this system for genetic improvement of wheat.
It is a method of population improvement of autogamous species that involves parental diallele series, F1 diallele series and selective mating series in the breeding procedure.