Final answer:
The phenotypic ratio of the offspring in a cross between a dwarf pea plant and a tall pea plant is 1:1.
Step-by-step explanation:
When using a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous), the phenotypic ratio of the offspring is 1:1. This means that half of the offspring will be tall and the other half will be dwarf.