Final answer:
The absence of albino pups from a mating between a red fox and an albino fox indicates that the red fox carries at least one dominant gene for pigment production, resulting in non-albino offspring with genotypes either Cc or CC.
Step-by-step explanation:
The genotype of the offspring from a red fox and an albino fox where no pups are albino can be determined by understanding the genetics of coat color. In a scenario similar to the coat color genetics in mice, where the mottled agouti coat color (A) is dominant to a solid coloration, and a separate gene (C) is responsible for pigment production, we can infer an equivalent fox scenario.
If the recessive c allele results in albino offspring, and no albino pups are present in the offspring, it suggests that at least one parent must possess the dominant C allele to provide pigment. Therefore, if the albino fox is of the cc genotype since albino is recessive, the red fox must have at least one C allele. This means that the albino fox is cc and the red fox is either Cc or CC. The resulting offspring would then have genotypes of either Cc (if the red fox is heterozygous) or CC (if the red fox is homozygous dominant), but none would be cc, which explains why there are no albino pups.