In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in $F_1$ generation?

To determine heterozygousity of a cross, one has to perform

If in a garden pea plant, a cross is made between red flowered and white flowered plants. What will be the phenotypic ratio in $F_2$ generation

In order to obtain the. $F_1$ generation Mendel pollinated a pure-breeding tall plant with a pure breeding dwarf plant. But for getting the $F_2$ generation, he simply self pollinated the tall $F_1$ plants. Why ?

For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.