Postzygotic barriers persist despite ongoing introgression in hybridizing Mimulus species.

ABSTRACT: The evolution of postzygotic isolation is thought to be a key step in maintaining species boundaries upon secondary contact, yet the dynamics and persistence of hybrid incompatibilities in sympatric species are not well understood.Here, we explore these issues using genetic mapping in three populations of recombinant inbred lines between naturally hybridizing monkeyflowers Mimulus guttatus and M. nasutus from the sympatric Catherine Creek population.The three M. guttatus founders differ dramatically in admixture history. Comparative genetic mapping also reveals three putative inversions segregating among the M. guttatus founders, two due to admixture. We observe strong, genome-wide transmission ratio distortion, but patterns are highly variable among populations

SUBMITTER: Mantel SJ 

PROVIDER: S-EPMC10418264 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature