In a cross made between true breeding tall pea plant and dwarf plant, 620 plants are obtained in F2 generation. How many of these plants have the genotype similar to the genotype of F1 generation plants.

In F2 generation the plants with TT, Tt and tt genotypes are obtained in 1:2:1 ratio. F1 generation plants have the genotype as Tt. Hence the number of F2 generation plants with genotype as Tt are 24× 620 = 310.