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Access to the article is free, however registration and sign-in are required. Evolution has been thought to act on small changes in the characteristics of organisms coded by genes called realizator genes. D. Tautz explains how a new result in this issue of Science by Gibson and Hogness (p. 200) shows that this may not always be true. A small phenotypic variation in Drosophila (sensitivity to ether), apparent only under environmental stress, turns out to be coded by a polymorphism in a selector gene, Ultrabithorax, a member of a class of genes that specifies whole body parts and anatomical regions.

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      Keywords:

      genetic variation,adaptations,NSDL_SetSpec_BEN,homeostasis concept,natural selection,oai:nsdl.org:2200/20110722030015910T,Life Science,microevolution,NSDL

      Language:

      English

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      Public - Available to anyone

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      Creative Commons Attribution Non-Commercial Share Alike

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