Final answer:
Grafting has the unique advantage of combining the favorable stem characteristics from one plant with the favorable root characteristics from another, creating a single plant with desirable traits from both.
Step-by-step explanation:
One advantage specific to grafting that is not associated with artificial pollination is the ability to combine the favorable traits of two different plants into a single individual. For instance, grafting can create a novel plant—often called a chimera—by attaching a stem (scion) from one plant with desired stem characteristics to the root system (stock) of another plant with desirable root traits. This is particularly useful in viticulture, where European grapevines, valued for their fruit, are grafted onto North American rootstocks that offer disease resistance. This method preserves the genetic integrity of the scion's fruit while taking advantage of the stock's hardiness.