Article
Symmetry breaking and the evolution of development.
Science (New York, N.Y.) - 29 Oct 2004
Palmer A Richard
Abstract excerpt
Because of its simplicity, the binary-switch nature of left-right asymmetry permits meaningful comparisons among many different organisms. Phylogenetic analyses of asymmetry variation, inheritance, and molecular mechanisms reveal unexpected insights into how development evolves. First, directional asymmetry, an evolutionary novelty, arose from nonheritable origins almost as often as from mutations, implying that...
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