Answer:
If Mendel crossed a true breeding dominant plant with a true breeding recessive plant the recessive trait is visible in the F3 generation.
Step-by-step explanation:
In Mendel’s cross the selected parents are a tall pea plant and a short pea plant. Tall is the dominant trait and short is the recessive trait. Both the parents are homozygous.
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