AP BIOLOGY

Detailed explanation-1: -Key Stimuli. Certain innate behaviors can be produced in all individuals of the same species. Usually, these behaviors are triggered by a key stimulus (KS).

Detailed explanation-2: -Releaser Mechanisms. The term releaser mechanism refers to an innate, biological relationship between an external sensory stimulus and a specific innate behavior. This relationship tends to remain invariant within a species, although it may be limited by maturity, sex, or hormonal status.

Detailed explanation-3: -In contrast, instincts are innate behaviors that are triggered by a broader range of events, such as aging and the change of seasons. They are more complex patterns of behavior, involve movement of the organism as a whole (e.g., sexual activity and migration), and involve higher brain centers.

Detailed explanation-4: -A releaser is a stimulus from one animal to another, which causes a particular response. The releaser, or sign stimulus triggers an innate releasing mechanism in the receiver. The receiver then does its response, the fixed action pattern (FAP). This kind of system is inherited by both animals.