Final answer:
A primary behavioral pattern refers to a fixed action pattern, in which a series of movements continues even when the stimulus is removed. An example is the aggressive behavior of male three-spined sticklebacks during breeding season.
Step-by-step explanation:
A primary behavioral pattern is a fixed action pattern, which is a series of movements elicited by a stimulus such that even when the stimulus is removed, the pattern goes on to completion. One example is the behavior of male three-spined sticklebacks during breeding season, where they develop a red belly and exhibit aggression towards other males. In laboratory experiments, these fish responded aggressively not only to other male sticklebacks, but also to objects that were painted red on their lower halves.