Two pigs whose tails are exactly 25 cm in length are bred over 10 years and they produce 96 piglets with the following tail lengths: 6 piglets at 15cm, 25 at 20 cm, 37 at 25 cm, 23 at 30 cm, and 5 at 35 cm. a. How many pairs of genes are regulating the tail length character? b. What offspring phenotype would you expect from a mating between a 15cm and a30cm pig?