A homozygous tall plant is crossed with a homozygous short plant. Tall is dominant and short is recessive. What is the expected outcome for the F1 generation?

All medium
All tall
All short
Half tall and half short

The expected outcome for the F1 generation would be that all of the plants would be tall.

The expected outcome for the F1 generation when a homozygous tall plant is crossed with a homozygous short plant is all tall. Since tall is dominant and short is recessive, all of the offspring in the F1 generation will inherit the tall trait from the homozygous tall parent.