In Mobile Ad hoc Network (MANET) multicast protocols are tightly coupled with association of nodeschannel ratio which leads to non-interference or low-interference communication. It is purely based on the linear and sequential approach to solve the channel assignment unicast routing or multicast routing as two disjoint subproblems. To overcome this, heuristic routing planner for exposure calculation and non-interference greedy optimized routing is designed by using genetic operator. The main focus of this study is genetic based cross layer optimization of relay selection for both unicast and multicast communication. Performance evaluation shows that the proposed scheme exhibits high performance in terms of packet delivery ratio, bandwidth utilization, throughput and delay when compared to Ad hoc On Demand Distance Vector (AODV) and Multicast Ad hoc On Demand Distance Vector (MAODV).