As any breeder will tell you, some hybrids exhibit vigor as compared to their parents, but others come up short. To better understand this seeming paradox of hybrid behavior, Enrico Coen at the John Innes Centre and his colleagues turned to studying gene expression in snapdragons. In particular, they focused on genes involved in flower asymmetry, CYC and RAD, and mapped how the expression levels of those genes, measured by RT-PCR and quantitative sequencing, affect plant phenotype. Their study was published in PLoS Biology.

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