Evolution: an exception that proves the rule.
A careful comparative analysis suggests a simple explanation for a category of exceptions to the general correlation between separate sexes in plants -- dioecy -- and self-incompatibility. In some genera, polyploidy causes failure of self-incompatibility, and dioecy may then evolve.
Charlesworth
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Institute of Cell, Animal and Population Biology, University of Edinburgh, Ashworth Laboratory, King's Buildings, W. Mains Road, Edinburgh EH9 3JT, UK.
D005075:Biological Evolution; D010944:Plants / Q000235:genetics*