Flowers of garden pea are bisexual and self pollinated. Therefore, it is difficult to perform hybridization experiment by crossing a particular pistill with the specific pollen grains. How Mendal made it possible in his monohybrid, dihybrid and trihybrid crosses?

Explanation

It is true that the flowers of garden pea are bisexual. However, Mendel made these flowers unisexual by artificail means. He emasculated (i.e., removed anthers before maturation) bisexual flowers to make then female fowers. Collected pollen grains from thses whcih were regarded functional male flowers. Thus, the pollen grains of spcifice male flowers are dusted over the stigma of emasculated flowr (female flower) to complete the process of hybridization. Finally the seesds were collected and sown to obtain `F_(1)` plants.