Answer:
There will be 600 tall plants in that generation.
Step-by-step explanation:
In Mendel’s cross the selected parents are a tall pea plant and a short pea plant. Both the parents are homozygous. The recessive trait is short. Letter T represents tall and t represents short. Hence the phenotype TT is homozygous dominant and tt is homozygous recessive.
The genotype Tt represents tall since T is dominant over t. Mendel’s cross can be represented as


F1 generation Tt Tt Tt Tt
F2 generation TT Tt Tt tt
In the F1 generation all the plants are tall and in the F2 generation 3/4 plants are tall and1/4 plants are short.
In the question it is given that 200 plants are short in the F2 generation. Let total number of offspring in the F2 generation is x.

x=800
number of tall plants =


Hence there will be 600 tall plants in the F2 generation.