What are complementary genes and supplementary genes?
Complementary genes are the genes which are present on different genetic loci but interact with each other to express a single character in combination. That is they both together produce a particular phenotypic trait in an individual.
Supplementary genes are the genes which include two pairs of non-allelic genes. Both of them are involved in affecting the same character.Out of the non-allelic genes, one gene is dominant and can express by itself. Second gene is also dominant but expresses only when it is supported by the presence of the first gene.