When a true-breeding tall plant is crossed with a true-breeding dwarf plant, what is the ratio of tall to dwarf plants in the F2 generation after self-pollinating the F1 plants?

Explanation

Crossing a pure tall plant with a pure dwarf plant results in all tall F1 offspring if tallness is dominant. Self-pollinating the F1 plants produces an F2 generation with a genotypic ratio of 1 tall homozygous : 2 tall heterozygous : 1 dwarf homozygous. However, if considering only pure tall (homozygous tall) and dwarf plants, the ratio is 1:1.