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The evolution of interspecies differences in morphology requires sufficient within-species variation in developmental regulatory systems on which evolutionary forces can act. Molecular analyses of naturally occurring alleles of the Arabidopsis thaliana CAULIFLOWER locus reveal considerable intraspecific diversity at this floral homeotic gene, and the McDonald-Kreitman test suggests that this gene is evolving in a nonneutral fashion, with an excess of intraspecific replacement polymorphisms. The naturally occurring molecular variation within this floral regulatory gene is associated with functionally different alleles, which can be distinguished phenotypically by their differential ability to direct floral meristem development.

proceedings of the national academy of sciences of the united states of america

Molecular population genetics of the <i>Arabidopsis CAULIFLOWER</i> regulatory gene: Nonneutral evolution and naturally occurring variation in floral homeotic function

Molecular population genetics of the Arabidopsis CAULIFLOWER regulatory gene: Nonneutral evolution and naturally occurring variation in floral homeotic function