In a cross between two mice that are heterozygous for agouti, black, color, and piebaldism, what is the probability that offspring will have solid black fur along with large patches of white fur? (Hint: Consider each gene separately; then use the multiplication rule. For more help getting started, see Hint 1.)

9/256

Explanation:

According to Mendel's experiments the results for the heterozygous are in the ratio 3:1

As  each gene is considered separately and the multiplication rule is used. Therefore the probability of getting a solid color would be 1/4 and black fur would be 3/4. Similarly the probability of getting the colored fur is 3/4 and getting a piebald( white patches) is 1/4

Then the combined probability is (1/4*3/4*1/4*3/4)= 9/256

it is either c or d and i know for sure it is not a or b