Question

On crossing tall plant with dwarf plant what is the ratio of dwarf plant in f2 generation?

Answer 1

On crossing tall plant with dwarf plant mendel found the ratio of dwarf plant in F2 generation

25 %

Answer 2

SEE it depends on the genotype of tall plant. Dwarf plant has genotype tt always.

If the tall plant is heterozygous tall Tt then the cross gives 2 tall plants  and 2 dwarf plants.

If the plant is homozygous tall TT then cross gives ALL TALL PLANTS with genotype Tt.

in short in heterozygous case 50% dwarf

and in homozygous case 0% dwarf