Final answer:
Based on Mendel's laws and given the phenotypic ratios, it is predicted that the parents' genotypes range from homozygous dominant or heterozygous to homozygous recessive, depending on the observed offspring's fur color ratio.
Step-by-step explanation:
The question relates to genetics and the inheritance patterns of fur color in offspring, based on the dominant and recessive alleles from the parents. We approach this question by considering Mendel's laws of inheritance, particularly the monohybrid cross and the concept of dominance. Since black fur is dominant to white, we use the symbols B for the dominant black allele and b for the recessive white allele. To create a Punnett Square, we need to infer the possible genotypes of the parents given the phenotypic ratio of their offspring.
Scenario A shows a majority of black offspring, suggesting at least one parent is likely homozygous dominant (BB) or both are heterozygous (Bb). For scenario B, roughly equal numbers of black and white offspring imply both parents are likely heterozygous (Bb)—a classic Mendelian 1:1 ratio in a case where one black allele is dominant. Scenario C indicates all offspring have the recessive phenotype, suggesting both parents are likely homozygous recessive (bb). Scenario D's all black offspring suggest at least one parent is homozygous dominant (BB), or both are heterozygous (Bb), but without more information about the other parent, a definitive genotype cannot be determined.