![]() ![]() In conjunction with previous allozyme studies, the cpDNA data suggest that the hybrid zone originated through historical local gene flow, yet is maintained by periodic long-distance pollen dispersal. pavia in the Piedmont, although they are at present locally extinct. The genealogy and structure of genetic variation further support the historical presence of A. Research on colour polymorphism (CP), which typically has a genetic basis, can shed light on this issue. Considerable cpDNA variation was detected in the hybrid zone, as well as ancestral cpDNA polymorphism furthermore, the distribution of haplotypes indicates limited interpopulation gene flow via seeds. Understanding how genetic diversity is maintained within populations is central to evolutionary biology. Restriction site and sequence data were subjected to phylogeographic and population genetic analyses. Haplotypes were sequenced for all cpDNA regions. Restriction site analyses identified 21 unique haplotypes among 248 individuals representing 29 populations from parental species and hybrids. The maternal inheritance of cpDNA in Aesculus was confirmed via sequencing of matK from progeny of controlled crosses. flava, three cpDNA regions (matK, trnD-trnT, and trnH-trnK) were analyzed. long-distance gene flow in the formation of a broad hybrid zone in central and northern Georgia that involves Aesculus pavia, A. ![]() This signature, which resembles that of other evolutionary processes, can. After speciation, ancestral balancing selection is revealed by genomic regions of high divergence between species. ![]() To evaluate the contribution of historical contact vs. Here, we discuss how ancestral balanced polymorphisms can be 'sieved' by the speciation process, which sorts them unequally across descendant lineages. Knowledge regarding the origin and maintenance of hybrid zones is critical for understanding the evolutionary outcomes of natural hybridization. ![]()
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