In pea plants flower position, stem length, and seed shape are controlled by independently assorting genes. Each characteristic has the following mode of inheritance:

Character Dominant Recessive
Flower position Axial (A) Terminal (a)
Stem length Tall (T) Dwarf (t)
Seed shape Round (R) Wrinkled (r)

If a plant that is heterozygous for all three characteristics is allowed to self-fertilize, what proportion of the offspring would you expect to be dwarf with terminal flowers and round seeds? Use the probability method to solve this genetic problem.