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 15 cm, 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. (Hint: count the # of phentotypic classes, or determine the sum of the ratios of the classes)
b.) What offspring phenotypes would you expect from mating between a 15-cm and 30-cm pig?