Ph.D. , Duke University 2006
A fundamental goal of evolutionary biology is to explain how populations become reproductively isolated species. Does speciation occur in allopatry or do populations diverge in the presence of some gene flow? What is the genetic basis of reproductive isolation? What are the evolutionary forces that create and maintain variation in speciation genes? My research tackles these questions in an emerging model system: the Mimulus guttatus species complex, a group of closely related, ecologically diverse wildflowers that exhibit tremendous variation in reproductive isolation between populations and species. I use a range of approaches – from field and greenhouse experiments to genetic mapping and bioinformatics – to investigate the genetic mechanisms and evolutionary dynamics of speciation.
- Sweigart, A. L., 2010. Simple Y-autosomal incompatibilities cause hybrid male sterility in reciprocal crosses between Drosophila virilis and D. americana. Genetics 184: 779-787.
- Sweigart, A. L., 2010. The genetics of postmating, prezygotic reproductive isolation between Drosophila virilis and D. americana. Genetics 184: 401-410.
- Sweigart, A. L., N. H. Martin, and J. H. Willis, 2008. Patterns of nucleotide variation and reproductive isolation between a Mimulus allotetraploid and its progenitor species. Molecular Ecology 17: 2089-2100.
- Sweigart, A. L., A. R. Mason, and J. H. Willis, 2007. Natural variation for a hybrid incompatibility between two species of Mimulus. Evolution 61: 141-151.
- Sweigart, A. L., L. Fishman, and J. H. Willis, 2006. A simple genetic incompatibility causes hybrid male sterility in Mimulus. Genetics 172: 2465-2479.
- Sweigart, A. L. and J. H. Willis, 2003. Patterns of nucleotide diversity are affected by mating system and asymmetric introgression in two species of Mimulus. Evolution 57: 2490-2506.
- Phippen, T. M., A. L. Sweigart, M. Moniwa, A. Krumm, J. R. Davie, and S. M. Parkhurst, 2000. Drosophila C-terminal binding protein functions as a context-dependent transcriptional cofactor and interferes with both Mad and Groucho transcriptional repression. Journal of Biological Chemistry 275: 37628-37637.
- Sweigart, A., K. Karoly, A. Jones, and J. H. Willis, 1999. The distribution of individual inbreeding coefficients and pairwise relatedness in a population of Mimulus guttatus. Heredity 8(5): 625-632.