Final answer:
To perform the given crosses, the pollen of a true breeding tall plant should be transferred to the stigma of a heterozygous dwarf plant, and the pollen of a heterozygous dwarf plant should be transferred to the stigma of a true breeding tall plant. This allows for determining the genotypes and inheritance patterns of the offspring.
Step-by-step explanation:
In this scenario, the first cross should be performed by transferring the pollen of a true breeding tall plant to the stigma of a heterozygous dwarf plant. The second cross should be performed by transferring the pollen of a heterozygous dwarf plant to the stigma of a true breeding tall plant.
This is because tall is dominant to short, so in order to determine the genotype of the true-breeding tall plants, they should be crossed with the known homozygous dwarf plants. Similarly, to determine the genotype of the true-breeding dwarf plants, they should be crossed with the known heterozygous tall plants.
By performing these crosses, you can obtain valuable information about the inheritance patterns and genotypes of the offspring.