Abstract
To understand evolutionary paths connecting diverse biological forms, we defined a three-dimensional genotypic space separating two flower color morphs of Antirrhinum. A hybrid zone between morphs showed a steep cline specifically at genes controlling flower color differences, indicating that these loci are under selection. Antirrhinum species with diverse floral phenotypes formed a U-shaped cloud within the genotypic space. We propose that this cloud defines an evolutionary path that allows flower color to evolve while circumventing less-adaptive regions. Hybridization between morphs located in different arms of the U-shaped path yields low-fitness genotypes, accounting for the observed steep clines at hybrid zones.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adaptation, Biological
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Alleles
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Antirrhinum / classification
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Antirrhinum / genetics*
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Base Sequence
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Biological Evolution*
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Crosses, Genetic
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Flowers / genetics*
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Gene Flow
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Gene Frequency
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Genes, Plant
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Genetic Speciation*
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Genotype
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Haplotypes
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Hybridization, Genetic
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Models, Genetic
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Molecular Sequence Data
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Phenotype
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Phylogeny
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Pigmentation / genetics*
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Pigments, Biological / genetics
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Principal Component Analysis
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Selection, Genetic
Associated data
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