Because each gene segregates independently, you need to determine the probability of each genotype independently and then multiply the four probabilities together. The probability of offspring with solid color (aa) is 1/4; the probability of offspring with black fur (BBor Bb) is 3/4; the probability of colored fur (CC or Cc) is 3/4; and the probability of piebald, or white patches (pp), is 1/4. The combined probability is 1/4 x 3/4 x 3/4 x 1/4 = 9/256.
