In genetics, the restoration of a wild-type function (e.g., ability to grow on galactose) in diploid heterozygotes generated from haploids, each of which carries a mutation in a different gene whose encoded protein is required for the same biochemical pathway. If two mutants with the same mutant phenotype (e.g., inability to grow on galactose) can complement each other, then their mutations are in different genes. ( Figure 8-11)