Polyphenism
![Biston betularia caterpillars on birch (left) and willow (right), demonstrating a color polyphenism.[1]](/Images/godic/202502/03/Biston_betularia2601.png")


A polyphenic trait is a trait for which multiple, discrete phenotypes can arise from a single genotype as a result of differing environmental conditions. It is therefore a special case of phenotypic plasticity.
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