(a) 75% of the plants of F2 generation appear tall while 25% appear short
(b) Phenotypic ratio- 3:1 That is Tall : Short
Genotypic Ratio- 1:2:1 That is, Homozygous tall: Heterozygous tall: Homozygous recessive
(c) We can see Short pea plants in F2 generation and not F1 generation. Since the cross is between two homozygous tall and short plants, the F1 generation shows dominant trait while the recessive trait gets suppressed. When the F1 tall pea plant is selfed, the short trait gets expressed.