Assuming that the three genes undergo independent assortment, predict the phenotypic ratio of the in the f2 generation. in a cross between these two plants (mmddpp x mmddpp), all offspring in the f1 generation are wild type and heterozygous for all three traits (mmddpp). now suppose you perform a testcross on one of the f1 plants (mmddpp x mmddpp). the f2 generation can include plants with these

There is a part of the question missing:

A wild-type tomato plant (Plant 1) is homozygous dominant for three traits: solid leaves (MM),normal height (DD), and smooth skin (PP).Another tomato plant (Plant 2) is homozygous recessive for the same three traits: mottled leaves (mm), dwarf height(dd), and peach skin (pp). (image 1)

As you can see in the Punett square presented below (image 2)                      in the                               F2             MmDdPp x mmddpp cross you get 8 phenotypes:

solid, normal, smooth  (MmDdPp genotype)

solid, normal, peach   (MmDdpp genotype)

solid, dwarf, smooth    (MmddPp genotype)

solid, dwarf, peach      (Mmddpp genotype)

mottled, normal, smooth  (mmDdPp genotype)

mottled, normal, peach   (mmDdpp genotype)  

mottled, dwarf, smooth    (mmDdPp genotype)

mottled, dwarf, peach     (mmddpp genotype)