The height of the seed head in wheat at maturity is determined by several genes

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The height of the seed head in wheat at maturity is determined by several genes. In one variety, the head is just 9 inches above the ground; in another, it is 33 inches above the ground. Plants from the 9-inch variety were crossed to plants from the 33-inch variety. Among the F1, the seed head was 21 inches above the ground. After self-fertilization, the F1 plants produced an F2 population in which 9-inch and 33-inch plants each appeared with a frequency of 1/256. (c) If a 21-inch F1 plant were crossed to a 9-inch plant, how often would you expect 18-inch wheat to occur in the progeny?