Rapid range expansions can cause pervasive changes in the genetic diversity and structure of populations. The postglacial history of the Balsam Poplar, Populus balsamifera, involved the colonization of most of northern North America, an area largely covered by continental ice sheets during the last glacial maximum. To characterize how this expansion shaped genomic diversity within and among pop...

In Heterodontus, a phylogenetically primitive shark species, the variable (VH), diversity (DH), joining (JH) segments, and constant (CH) exons are organized in individual approximately 18-20-kb "clusters." A single large VH family with > 90% nucleic acid homology and a monotypic second gene family are identified by extensive screening of a genomic DNA library. Little variation in the nucleotide...

This study investigated the genetic diversity of morchella species using randomly amplified polymorphic DNA markers. Morchella species are an important group of edible mushrooms belonging to the family Helveliaceae with medicinal and economical significance. In this study we have developed an efficient method of genomic DNA isolation which was amplified by eight RAPD primers to test the polymor...

introduction despite the fact that iran is one of the major chickpea (cicer arietinum l.) center of origins, limited information is available regarding chickpea genetic variation and diversity. genetic diversity information is crucial for the choice of proper parents to establish new breeding programs. chickpea germplasm is poor, suggesting the need for gaining enough knowledge of genetic diver...

objective(s) resistance to antimicrobial agents, particularly metronidazole and clarithromycin, is frequently observed in helicobacter pylori and may be associated with treatment failure. this resistance rate varies according to the population studied. the aim of this study was to assess the pattern of antimicrobial resistance of h. pylori isolates from dyspeptic patients in isfahan. materials ...

The genomic architecture underlying ecological divergence and ecological speciation with gene flow is still largely unknown for most organisms. One central question is whether divergence is genome-wide or localized in 'genomic mosaics' during early stages when gene flow is still pronounced. Empirical work has so far been limited, and the relative impacts of gene flow and natural selection on ge...