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Science 12 October 2007:
Vol. 318. no. 5848, pp. 202 - 203
DOI: 10.1126/science.1150197
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Perspectives

EVOLUTION:
Stable Heterozygosity?

Matthew Meselson1 and David Mark Welch2

Evolutionary change in organisms that reproduce asexually may be driven in part by the divergent function of genes that were formerly alleles.

1M. Meselson is in the Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, and Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biology Laboratory, Woods Hole, MA 02543, USA. E-mail: msm{at}wjh.harvard.edu

2D. Mark Welch is at the Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, MA 02543, USA.

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