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Science 19 October 2007:
Vol. 318. no. 5849, p. 376
DOI: 10.1126/science.318.5849.376
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News of the Week

EVOLUTION:
Natural Selection, Not Chance, Paints the Desert Landscape

Elizabeth Pennisi

Two evolutionary biologists have found that the color patterns in a flower called desert snow, which for 60 years have been attributed to genetic drift, are actually the result of natural selection.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)