Reproductive isolation as a pleiotropic effect of copper tolerance in Mimulus guttatus?

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A genetic system producing postmating reproductive isolation between two populations of Mimulus guttatus is described. In one population, Copperopolis, there is a single gene tightly linked to, or pleiotropic to, the gene for copper tolerance. In the other, Cerig-y-drudion, a limited number of genes are involved. The genes interact in a complementary manner to produce F1 inviability. These results suggest that reproductive isolation could evolve as a direct result of adaptive differentiation in sympatry.


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MacNair, M., Christie, P. Reproductive isolation as a pleiotropic effect of copper tolerance in Mimulus guttatus?. Heredity 50, 295–302 (1983) doi:10.1038/hdy.1983.31

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