How do wild plants and animals differ from their cultivated relatives?

Cultivated plants and animals, unlike their wild relatives, were artificially selected. For centuries, humans have been engaged in targeted breeding, breeding more productive plants and animals. Some of the resulting species and breeds are no longer able to reproduce in the wild. For example, corn: its grains are too densely packed together on the cob, so that if they are not separated from the cob, they are unable to germinate. In the course of selection, the size of the fruits increased significantly, their taste improved.