selection of parents
selection of parents to be use in hybridization open
generally selection on the basis of the their known performance
relative values of gca and sca
gca is more important, a large number of parents should be use
gca should be uses in hybridization
sca is more important, a large number of parents should be use
to product a large number of f1 families
production
single crosses (two parents)
poly crosses (more than two parents)