Fluffernutter labradors are identical to Earth labradors in every way, except that they grow marshmallows instead of fur. The three possible types of marshmallow skin are: a. Black (tastes like licorice); b. Chocolate (tastes like chocolate); c. Yellow (tastes like vanilla). There are two genes that control for this phenotype, acting in a recessive epistatic manner. The two-locus genotypes that correspond to the phenotypes are: