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Ancestral polymorphism and gene flow11/30/2023 ![]() ![]() RAD sequencing holds great promise for detecting patterns of divergence and gene flow in highly divergent hybridizing species. Our results help explain the origin of the 'genomic mosaic' seen in these taxa with 'porous' genomes and suggest rampant introgression or extensive among-species conservation of an incipient plant sex chromosome. Recent studies have suggested that multiple domestications and introgression are more common than previously thought. Divergence estimates were significantly autocorrelated (P 400). Abstract The widespread use of genomic tools has allowed for a deeper understanding of the genetics and the evolutionary dynamics of domestication. the proportion of fixed SNPs) between species, and these results are unlikely to be strongly biased by genomic features of the Populus trichocarpa reference genome used for SNP calling. Windowed analyses indicate great variation in genetic divergence (e.g. Our study also suggests that, both shared polymorphism among lineages, resulting from standing genetic variation or introgression, and chromosomal rearrangements may contribute to local. In general gene flow is hard to set apart from ancestral polymorphism. We have scanned the 'porous' genomes of Populus alba and Populus tremula, two ecologically divergent hybridizing forest trees, using >38,000 SNPs assayed by restriction site associated DNA (RAD) sequencing. Regardless of mechanism, there is ample evidence of genetic exchange due to. ![]() This issue can now be overcome by the use of 'next generation' or short-read DNA-sequencing approaches capable of assaying many thousands of single nucleotide polymorphisms (SNPs) in divergent species. One important obstable of previous studies of this topic was the low genomic coverage achieved. Recent advances in population genomics have triggered great interest in the genomic landscape of divergence in taxa with 'porous' species boundaries. ![]()
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