Find the best entry-tester combinations in a diallel cross
Refer to Which-won-where and apply the following interpretations:
- An irregular polygon (convex hull) is drawn on entries that are most interactive to the testers in various directions so that all other entries are contained in the polygon;
- The perpendicular lines to the sides of the convex hull divide the biplot into sectors;
- The best crosses, i.e., hybrids or entry-tester combinations, are those between the vertex entries and the testers falling within their respective sectors;
- The vertex genotype is said to be the best mating partner for, or have the highest specific combining ability with, the testers falling within its respective sectors.
Note: In a diallel cross dataset, each genotype is both an entry (in blue) and a tester (in red).