(N/A) Mendel selected two pea plants,one with a tall stem and the other with a dwarf stem. These plants were considered parent plants $(P)$,which were true-breeding (maintaining purity of traits over several generations).
In the female parent plant,the stamens were removed from the immature flower. This flower was covered with a small paper bag until it matured. Then,pollen grains collected from the male dwarf plant were dusted onto its stigma.
Pea flowers are bisexual. In this method,one plant is treated as male and the other as female.
The stamens of the plant designated as female are removed at the juvenile (immature) stage. This process is called emasculation,which is done to prevent self-pollination.
The emasculated flower is covered with a bag to prevent unwanted cross-pollination. This is called bagging.
Mature pollen grains from the male plant are collected and dusted onto the stigma of the emasculated flower.
The seeds from this plant are collected,sown,and grown into a new generation of plants.
This generation is called the first filial generation ($F_1$ generation).