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Article

Positive selection and ancient duplications in the evolution of class B floral homeotic genes of orchids and grasses.

BMC evolutionary biology - 21 Apr 2009

Mondragón-Palomino Mariana, Hiese Luisa, Härter Andrea, Koch Marcus A, Theissen Günter

Abstract excerpt

BACKGROUND: Positive selection is recognized as the prevalence of nonsynonymous over synonymous substitutions in a gene. Models of the functional evolution of duplicated genes consider neofunctionalization as key to the retention of paralogues. For instance, duplicate transcription factors are specifically retained in plant and animal genomes and both positive selection and transcriptional divergence appear to...

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PMID: 19383167
DOI: 10.1186/1471-2148-9-81
PMCID: PMC2680841

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