What will be the appearance of (a) F1 and (b) F2 progenies when a pure (homozygous) tall pea plant is crossed with a pure (homozygous) dwarf pea plant?

In F1 generation all the plants will be heterozygous tall (Tt) . When the plants of F1 plants are selfed amongst themselves 1 plant will be homozygous tall (TT) 2 plants will be heterozygous tall (Tt) and 1 will be homozygous dwarf (tt). It can be understood easily with the help of a Punnett square. Thus in F2 phenotypic ratio is 3:1 and genotypic ratio is 1:2:1.

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