This paper studies the genetical relationship between relativeheritability and combining ability and the genetical mechanism of heterosis.It works out the mathematical models of significant tests of relative heritabi-lity and degrees of dominance based on the significant test of combining abi-lity differences. These modes can be used to test the significances of percen-tage heterosis over mid-parents and superior parent and relative heterosis ofhybrids simultaneously. The experimental data of 6×6 diallel crosses(with-out reciprocals) in oilsee...
