Practice question

A Batesian mimic lacks the costly defense of the model but resembles its warning signal. A harmless hoverfly, for example, may gain protection by resembling a stinging wasp, because experienced predators generalize avoidance from model to mimic. The mimic benefits while the model can be disadvantaged if edible mimics make the signal less reliable. When both similar species are genuinely defended, the system is Müllerian rather than Batesian. Being merely distasteful would itself constitute a defense and would not match the defining harmless-mimic relationship. The evolutionary advantage depends on predator perception, sufficient similarity, and models remaining common enough to maintain avoidance. The distinction is biologically useful because ecological labels summarize mechanisms that generate testable predictions. Evaluating costs, benefits, timing, and the identities of interacting organisms prevents confusion between terms that may look similar in a short description. Mechanistic reasoning is essential here: classifications should follow measurable consequences for survival, reproduction, resource acquisition, or detection. Context can modify interaction strength, but it does not erase the defining contrast among the alternatives presented.