i'm gonna put a couple so you can chose from
explanation:
if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.
if either parent mouse passes a dominant allele, the offspring will have black fur.
if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)
hope this : )