Practice question

Mertensian, or Emsleyan, mimicry proposes that an extremely dangerous or lethal species resembles a less harmful but still defended species. A predator may survive an encounter with the moderately harmful model and learn to avoid its warning pattern, then also avoid the deadly mimic. If the predator's first encounter with the lethal species caused death, that individual could not learn, so selection for an educational signal would be difficult to explain directly. This arrangement differs from Batesian mimicry, where a harmless form copies a defended one, and Müllerian mimicry, where defended species converge on a shared warning. The theory addresses how lethality constrains predator learning. From an evolutionary perspective, traits persist when their net effects improve inclusive or direct fitness under prevailing conditions. The ecological terminology therefore summarizes both an immediate mechanism and its likely consequences across generations. A careful interpretation retains the assumptions of the underlying model and avoids extending it beyond available evidence. Within those assumptions, the keyed concept gives the most consistent account of the biological pattern and its expected outcome.