As in the spider angry ball, dominant and codominant mutant genes generally produce the morph in a hybrid.
Recessive mutant genes produce a morph only if both parents have compatible genes. If the genes are not compatible, the babies look normal, for a hybrid.
For example, amelanistic (AKA albino) corn snakes have been bred to tyrosinase-negative albino black rat snakes and to tyrosinase positive albino black rat snakes. All three mutant genes are recessive to the corresponding normal genes. Albino babies are only produced when the amelanistic corn is mated to the tyrosinase-negative albino black rat snake. This shows that the corn snake's amelanistic gene is only compatible with the black rat snake's tyrosinase-negative albino gene.
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