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Journal Article

Balancing Selection on a Floral Polymorphism

Banu Subramaniam and Mark D. Rausher
Evolution
Vol. 54, No. 2 (Apr., 2000), pp. 691-695
Stable URL: http://www.jstor.org/stable/2640874
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Balancing Selection on a Floral Polymorphism
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Abstract

The common morning glory, Ipomoea purpurea, exhibits a flower color polymorphism at the W locus throughout the southeastern North America. The W locus controls whether flowers will be darkly pigmented (WW), lightly pigmented (Ww), or white with pigmented rays (ww). In this report, we describe results of a perturbation, or convergence, experiment using five plots designed to determine whether balancing selection operates on the W locus. The pattern of gene frequency changes obtained are indicative of balancing selection operating at the W locus, providing direct evidence that both the alleles are actively maintained by selection.

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