In North America and Europe, the pea aphid ( Acyrthosiphon pisum ) encompasses ecologically and genetically distinct host races, offering a model system for studies on sympatric speciation ([ 1 ][1], [ 2 ][2]). One host race lives on red clover ( Trifolium pratense ) and cannot produce offspring on
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Tsuchida et al. (2004) studied this question.
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