Fill in the blanks.
The modern technique in the field of crop variety improvement is known as___
In this technique, a desired gene possessing a superior character is introduced into the plant.
The modern technique in the field of crop variety improvement is known as ________.
The process of producing new variety of crops by crossing two genetically different parent crops is known as_____________.
The method of producing new variety of crops that are superior to the existing varieties is known as_____________.