What is the effect of the genes of the parental mice on the fur color of the offspring mice?”

in mendelian genetic , allele of each genes from the parents will segregate from each other so the gametes only carry one each.

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)

digestion

it excretes wastes