Hybridization not only generates genetic diversity, but this diversity can alter the shape of the fitness landscape, changing which genotypic combinations are favored by natural selection and which accessible genotypic paths lead to novel fitness peaks.

The evolution columbine genus involved frequent mixing between incipient species, and one chromosome appears to have taken its own path.

Genetic change among enzyme orthologous with similar phenotypic properties can cause substantial differences in evolutionary response to a new enzyme function in terms of their molecular and fitness outcomes.

Baltic and Arctic ecotypes of the marine midge Clunio emerged from a recent adaptive radiation, which is based on standing genetic variation at many loci involved in time-keeping and nervous system development.

Variation in autumnal expression from starting expression levels and initial cold-down-regulation, rather than epigenetic silencing, is the major field variable conferred by worldwide haplotypes of the floral repressor gene, FLC.

Phylogenetic and computational methods reveal that at least two seasonal coronaviruses are evolving adaptively in the region of the viral spike protein exposed to the human humoral immune system.

A wild tomato species adopts local fruit color via introgression from an endemic relative, during its invasion onto the Galápagos Islands.

Environmentally responsive genes evolve under strong selective constraint in Arabidopsis lyrata.

A set of adaptive mutations affect only a small number of phenotypes that matter in the evolution condition, and yet contain substantial latent functional diversity revealed in distant environments.

Genome wide association analyses in a wild-derived Drosophila melanogaster population uncover extensive variation in cuticular hydrocarbon composition, which may present a target for natural selection and adaptive evolution.