Genetic manipulation: The process in which the gene for a particular character is introduced inside the chromosome of a cell. When the gene for a particular character is introduced in a plant cell, a transgenic plant is produced.
These transgenic plants exhibit characters governed by the newly introduced gene.
For example, let us assume there is a wild plant that produces small fruits. If the gene responsible for a larger fruit size is introduced in this plant, this plant becomes transgenic, and starts producing larger fruits.
It plays an important role & helps in improving crop variety. It ensures food security and insect resistant crops. It also improves the quality and yield of crops.