Contents

27 June 1986
Vol 232, Issue 4758

About The Cover

Natural populations of wild radish (Raphanus raphanistrum) frequently contain a genetic polymorphism for flower color. The recessive yellow morphs are more attractive to pollinators than are the white morphs. The increased attractiveness results in more pollen from yellow-flowered individuals being spread among other plants in the population. Consequently, the fitness of the yellow plants is enhanced. See page 1625. [Allison A. Snow, Department of Botany, University of California, Davis, CA 95616]