LSU Digital Commons LSU Digital Commons Chromosomal inversions and the reproductive isolation of Chromosomal inversions and the reproductive isolation of species species
LSU Digital Commons LSU Digital Commons Chromosomal inversions and the reproductive isolation of Chromosomal inversions and the reproductive isolation of species species
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最近的遗传学研究表明，许多基因导致了近缘物种之间的差异，从而阻止了基因交换，特别是杂交雄性不育和雌性物种偏好。我们研究了两种杂交的北美果蝇（Drosophila pseudobscura和Drosophilapersimilis）的杂种不育性和雌性物种偏好的遗传基础。与其他物种组中的发现相反，基因组中很少有区域与这些特征相关，这些区域也与这些物种之间的固定排列差异（倒位）相关。从我们的研究结果中，我们提出了一个初步的基因模型，反转可能有助于物种形成过程，从而解释了丰富的地理上共同发生的密切相关的物种之间的安排差异。我们认为，倒位产生连锁群，导致不育杂交类群之间持续存在。这种不育性的维持使物种在基因突变的情况下比没有这种倒位的情况下能坚持更长的时间，自然选择将有更大的机会减少物种间交配的频率。
Recent genetic studies have suggested that many genes contribute to differences between closely related species that prevent gene exchange, particularly hybrid male sterility and female species preferences. We have examined the genetic basis of hybrid sterility and female species preferences in Drosophila pseudoobscura and Drosophilapersimilis ,twooccasionallyhybridizingNorthAmerican species. Contrary to findings in other species groups, very few regions of the genome were associated with these characters, and these regions are associated also with fixed arrangement differences (inversions) between these species. From our results, we propose a preliminary genic model whereby inversions may contribute to the speciation process, thereby explaining the abundance of arrangement differences between closely related species that co-occur geographically. We suggest that inversions create linkage groups that cause sterility to persist between hybridizing taxa. The maintenance of this sterility allows the species to persist in the face of gene flow longer than without such inversions, and natural selection will have a greater opportunity to decrease the frequency of interspecies matings.