Final answer:
When a black rabbit is mated with a white rabbit in a scenario of codominance, the offspring will exhibit a phenotype that reflects a mixture of both parent's coat colors, possibly resembling the chinchilla phenotype of black-tipped white fur.
Step-by-step explanation:
In rabbits, coat color is determined by multiple alleles, and a specific hierarchy of dominance exists among these alleles. When a black rabbit is mated with a white rabbit, assuming that black is a result of the chinchilla allele (cchcch) showing incomplete dominance and white is the albino (cc), the offspring would display a phenotype that partially reflects both parents. In this example of codominance, one would expect the resulting offspring to have a phenotype that is a mixture of the black and white coat, which could be similar to the chinchilla phenotype (black-tipped white fur). However, if the allelic series in rabbits is considered where the wild-type allele (C+) is dominant over chinchilla and Himalayan, and chinchilla is incompletely dominant over albino, the exact offspring phenotype would depend on the specific alleles involved in the parental genotypes. The phenotypic ratio of the offspring cannot be determined without knowing the precise genotype of the white rabbit.