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The queen‐worker caste system of eusocial insects represents a prime example of developmental polyphenism (environmentally‐induced phenotypic polymorphism) and is intrinsic to the evolution of advanced eusociality. However, the comparative molecular basis of larval caste determination and subsequent differentiation in the eusocial Hymenoptera remains poorly known. To address this issue within bees,...
Two recent papers by Volny and Gordon and Julian et al. show that caste in harvester ants Pogonomyrmex barbatus and P. rugosus can be determined exclusively by genotype. This is in contrast to all previous examples of caste-determination in social insects, where environmental factors have been shown to be the most important determinants. Genetic caste determinism is hypothesized to have arisen through...
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