Article
Directional selection is the primary cause of phenotypic diversification.
Proceedings of the National Academy of Sciences of the United States of America - 17 Sept 2002
Rieseberg Loren H, Widmer Alex, Arntz A Michele, Burke John M
Abstract excerpt
Selection is widely accepted as the principal force shaping phenotypic variation within populations. Its importance in speciation and macroevolution has been questioned, however, because phenotypic differences between species or higher taxa sometimes appear to be nonadaptive. Here, we use the quantitative trait locus (QTL) sign test to evaluate the importance of directional selection in phenotypic divergence. If...
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