Reciprocal recurrent selection is used when a character is governed by

Reciprocal recurrent selection is used when a character is governed by Additive genes and Non-additive genes.
RRS is a cyclical breeding procedure designed to improve the cross of two populations from different heterotic groups by using both general and specific combining ability.
This method is equally effective with incomplete, complete and overdominance. This method is used when a character is governed by both additive and non additive gene action.