Only one combination produces the self phenotype:  “a-a.”  When you see a self rabbit (for example a black tortoiseshell), you also know the genotype for the “a” gene (a-a). Examples include chestnut, opal, lynx, orange, chinchilla, steel, and many more. utmx_section("Personal Footer"). These Agoutis carry the harlequin/tricolor brindling gene recessively. Although there are three possible genes, each rabbit can only show one and carry one. Also, it could be that agouti shows up completely differently on rex fur and thus is called a different color. The belly is cream.