MIMICRY & DEFENCE

MIMICRY & DEFENCE

Praying mantis blending with flowers shows:

A flower-associated praying mantis can use aggressive mimicry when floral resemblance helps it deceive and capture pollinators. Matching petal color, adopting a flower-like posture, and remaining motionless reduce recognition as a predator; in some species, body parts may even act as attractive floral-like signals. Bees, flies, or butterflies then approach within striking range. The adaptive beneficiary is the predator, which distinguishes aggressive mimicry from defensive systems. Müllerian mimicry requires two or more defended species sharing an honest warning pattern, while Batesian mimicry

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

The mimic and model resemble each other but are unrelated due to:

Resemblance between unrelated model and mimic is an example of convergent evolution produced by selective advantage, not shared ancestry or gene flow. Individuals in the mimic population that more closely match a signal already avoided by predators survive and reproduce at higher rates. Across generations, selection increases alleles affecting color, shape, movement, odor, or other relevant traits, even though the model belongs to a separate lineage. Habitat sharing can create the ecological opportunity because both organisms encounter the same receivers, but proximity alone does not generate

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

The resemblance between unpalatable butterfly species helps:

Resemblance among unpalatable butterfly species accelerates predator education because each encounter reinforces the same warning signal. A bird that samples one defended species and experiences bitterness, nausea, or another cost can generalize avoidance to other species bearing the shared pattern. Consequently, fewer individuals of each species need to be attacked before the local predator population learns, reducing the per-species cost of establishing warning. This is the central advantage of Müllerian mimicry. The effect is more precise than simply “confusing” predators: successful warnin

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Which of these represents Müllerian mimicry correctly?

Monarch and viceroy butterflies are now widely treated as a Müllerian mimicry pair because both are unpalatable and share a similar orange-and-black warning pattern. Monarch larvae sequester cardenolides from milkweeds, although toxicity varies with host plant and individual. Viceroys possess their own deterrent compounds, including salicylate-derived chemicals obtained from willow relatives, and feeding experiments have shown that they can be unpalatable to birds. Because both participants impose a cost on predators, resemblance helps predators learn and remember one generalized avoidance sig

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Bombardier beetles are examples of:

Bombardier beetles combine an effective chemical defense with conspicuous cues that predators can learn to avoid. When threatened, they mix stored hydroquinones and hydrogen peroxide with enzymes in a reinforced reaction chamber, generating hot, irritating quinones that are expelled in rapid pulses. The reaction can approach the boiling point of water, and the beetle can direct the spray toward an attacker. Many species also display contrasting coloration or characteristic postures that can function aposematically by advertising their defensive capacity before discharge. A predator that associ

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Coral snake serves as a ______ in mimicry.

In defensive mimicry, a model is the organism whose genuine properties give meaning to the signal copied by another species. A venomous coral snake bears a conspicuous banded pattern that predators may learn, or sometimes be predisposed, to avoid. A harmless or less dangerous snake resembling that pattern can consequently receive protection as a Batesian mimic. The coral snake is therefore the defended reference phenotype, while the look-alike is the mimic. Calling the coral snake an educator anthropomorphizes the process: predators acquire information through encounters, but the snake does no

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

A grasshopper blending in with dry leaves is an example of:

A grasshopper whose body color and outline merge with dry leaves displays cryptic coloration. Crypsis lowers the probability that a predator detects or recognizes the animal against its visual background. Brown mottling can match leaf luminance and texture, while flattened shape, irregular margins, immobility, and leaf-like posture may further disrupt the body outline. Selection favors combinations that reduce the receiver’s ability to separate prey from environmental noise. Aposematism works in the opposite direction by increasing conspicuousness and advertising a defense. Batesian mimicry re

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Which is a form of dishonest signaling?

A Batesian mimic sends a dishonest signal because its appearance predicts a defense that it does not possess. The warning phenotype is normally maintained by a genuinely noxious, venomous, or otherwise unprofitable model. Predators learn to avoid that phenotype after costly encounters with the model, then generalize their avoidance to the harmless mimic. The mimic thus gains survival benefits by exploiting information encoded in the model’s signal. Dishonesty here is functional rather than intentional: natural selection favors resemblance because receivers respond as though the mimic were defe

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Which of these is *not* a mimicry type?

Mertensian, Wasmannian, and Batesian are recognized terms for distinct forms of mimicry, whereas “transitive mimicry” is not a standard biological category. Mertensian mimicry proposes that a highly dangerous species converges on the warning pattern of a less dangerous species because predators cannot learn from fatal encounters with the most dangerous form. Wasmannian mimicry involves guests or parasites resembling social insects in whose colonies they live. Batesian mimicry occurs when an undefended or palatable organism gains protection by resembling a defended, avoided model. These labels

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Bright coloration and bad taste together are indicative of:

Bright coloration coupled with an unpleasant taste is the characteristic combination underlying aposematism. A defended animal advertises its low profitability through a conspicuous signal, and predators learn after one or a few adverse encounters to avoid similarly patterned prey. The bad taste supplies the reinforcing cost; the bright pattern improves detection, recognition, and memory. This may initially seem paradoxical because conspicuous prey are easier to locate, but once avoidance develops, the reduction in repeated attacks can exceed the cost of occasional predator education. Aggregat

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

Which of the following is an example of aggressive mimicry?

A crab spider concealed on a flower exemplifies aggressive mimicry when its color, posture, and sometimes ultraviolet reflectance make it resemble floral tissue or another attractive cue, thereby allowing it to approach or remain undetected by pollinating prey. The deception benefits the predator rather than protecting an edible organism from predation. Visiting bees or flies respond to the flower’s signals and come within striking distance before detecting the spider. Some flower-dwelling spiders are better described as cryptic because they merely match the background; the term aggressive mim

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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MIMICRY & DEFENCE

A harmless fish resembling a venomous one shows:

A harmless fish that resembles a venomous fish gains protection without producing the costly defense itself, which is the defining asymmetry of Batesian mimicry. Predators that have been injured by, or have learned to avoid, the venomous model generalize its recognizable shape, coloration, or behavior to the edible mimic. The mimic benefits because mistaken identity lowers attack probability, while excessive mimic abundance can disadvantage the model by making its warning signal less reliable. This contrasts with Müllerian mimicry, where both resembling species are defended and share the cost

Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10

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