Final answer:
The phenotype of the cross between a homozygous dominant tall plant and a homozygous recessive short plant is 100% tall.
Step-by-step explanation:
When a homozygous dominant tall plant is crossed with a homozygous recessive short plant, the phenotype of the offspring will be 100% tall. This is because the dominant allele for tallness masks the presence of the recessive allele for shortness. The genotype of the offspring will be heterozygous for tallness.
Learn more about Punnett Squares