Final answer:
Master regulators in biology, like Ey in Drosophila, have the power to activate their regulatory networks outside their normal location, which can result in unique developmental outcomes. For example, the Ey gene can control the development of a functional third eye in beetles.
Step-by-step explanation:
Master regulators, such as Ey in Drosophila, have the ability to activate their regulatory networks outside their normal location. This means that they can influence gene expression and control the activities of other genes in different cells and tissues of the organism. One example of this is the presence of a functional third eye in beetles, which is controlled by the Ey gene. When normal eye development is prevented, the third eye still develops and responds to light.