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  Topic: The Origin of "Information" via natural causes, Refuting a key ID claim (refs, webpages)< Next Oldest | Next Newest >  
niiicholas



Posts: 319
Joined: May 2002

(Permalink) Posted: Oct. 01 2002,14:02   

Here's a different one:

http://www.pnas.org/cgi/content/abstract/152445399v1

Quote

Published online before print September 17, 2002
Proc. Natl. Acad. Sci. USA, 10.1073/pnas.152445399
Evolution of moth sex pheromones via ancestral genes

Wendell L. Roelofs *, Weitian Liu *, Guixia Hao *, Hongmei Jiao *, Alejandro P. Rooney , and Charles E. Linn Jr. *
*Department of Entomology, Cornell University, Geneva, NY 14456; and Department of Biological Sciences, Mississippi State University, Mississippi State, MS 39762

Contributed by Wendell L. Roelofs, July 28, 2002

Mate finding in most moth species involves long-distance signaling via female-emitted sex pheromones. There is a great diversity of pheromone structures used throughout the Lepidoptera, even among closely related species. The conundrum is how signal divergence has occurred. With strong normalizing selection pressure on blend composition and response preferences, it is improbable that shifts to pheromones of diverse structures occur through adaptive changes in small steps. Here, we present data supporting the hypothesis that a major shift in the pheromone of an Ostrinia species occurred by activation of a nonfunctional desaturase gene transcript present in the pheromone gland. We also demonstrate the existence of rare males that respond to the new pheromone blend. Their presence would allow for asymmetric tracking of male response to the new blend and, thus, evolution of an Ostrinia species with structurally different sex pheromone components.


Edited by niiicholas on Oct. 01 2002,14:03

  
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