The Extended Phenotype
Gene-influenced effects can extend beyond an organism's body into its environment.
The Mechanism: Richard Dawkins used the extended phenotype to describe effects of genes expressed through an organism's actions on the external world, such as a beaver dam or a parasite's influence on a host. The concept does not mean genes directly control every environmental outcome.
The Philosophical Pivot: A body is not the only place where biological influence becomes visible. Structures and altered relationships may reflect an organism's evolutionary history while remaining shaped by many other causes.
The Horizon: The concept challenges a simple boundary between organism and environment, but it does not erase that boundary entirely. Ecological effects emerge from interactions among genes, development, behavior, and surroundings.
Calling an effect gene-related is not the same as calling it genetically predetermined. The same organism can produce different outcomes under different conditions.
An organism changes its world, and that changed world can become part of the conditions future organisms inherit.
Life extends into the world it changes, but never controls the world alone.
Which parts of my environment reflect my choices, and which forces have shaped them beyond my control?