In pea plants, the traits for plant height, seed shape, and pod color are coded by genes with two alleles. The allele for tall plants (T) is dominant over the allele for short plants (t), the allele for round seeds (R) is dominant over the allele for wrinkled seeds (r), and the allele for green pods (G) is dominant over the allele for yellow pods (g). A plant that is heterozygous for all three traits is crossed with a plant that is heterozygous for height, is homozygous with round seeds, and has yellow pods. How many phenotypes are possible from this cross?