Final answer:
The correct example of duplicate recessive epistasis given in the options is coat color in Labrador retrievers, where the ee genotype results in a yellow lab, demonstrating the epistasis of the E gene over the B gene.
Step-by-step explanation:
The example of duplicate recessive epistasis among the given options is coat color in Labrador retrievers. In Labrador retrievers, the E gene is epistatic to the B gene. Specifically, when there is a homozygous recessive ee genotype, the dog's color will be yellow regardless of the B gene's allelic combination. In contrast, homozygous or heterozygous presence of the dominant E allele allows the B gene to express, resulting in either black or chocolate fur based on the allelic combination of the B gene.
An appropriate example of duplicate recessive epistasis would involve two separate genes where a recessive condition at any one of the two suppresses the expression of the other, leading to a specific phenotype. One such example is seen in mice coat color, where a mouse that is homozygous recessive (cc) for the C gene will be albino, regardless of the A gene's alleles, making the C gene epistatic to the A gene.