Oliveira D C S G, Wintermute E H, Etges W J, Heed W B, O'Grady P M, Desalle R
Division of Invertebrate Zoology, American Museum of Natural History, New York, NY 10024, USA.
Hereditas. 2003;139(3):223-7. doi: 10.1111/j.1601-5223.2003.01761.x.
Sequences from three gene regions from the nuclear and mitochondrial genomes were used to examine the extent and nature of hierarchical structure in the Drosophilamojavensis cluster (Drosophila arizonae, D. mojavensis and D. navojoa) of the D. repleta species group. To determine the genetic divergence of these three species, sequence data were analyzed using maximum parsimony and population aggregation analysis. Individual and combined gene genealogies indicate that D. arizonae and D. mojavensis are neither diagnosable nor monophyletic with respect to one another. Although D. navojoa has differentiated from D. arizonae and D. mojavensis, as diagnosed by nuclear gene sequences, it may have undergone a reticulation event with D. arizonae. Our results suggest that either these taxa are still undergoing differentiation at the molecular level or have experienced gene flow in the recent past.
来自核基因组和线粒体基因组三个基因区域的序列被用于研究拟果蝇物种组的莫哈韦果蝇簇（亚利桑那果蝇、莫哈韦果蝇和纳沃霍果蝇）中层次结构的程度和性质。为了确定这三个物种的遗传分化，使用最大简约法和群体聚合分析对序列数据进行了分析。个体和组合基因谱系表明，亚利桑那果蝇和莫哈韦果蝇彼此之间既无法区分，也不是单系的。尽管根据核基因序列诊断，纳沃霍果蝇已与亚利桑那果蝇和莫哈韦果蝇分化，但它可能与亚利桑那果蝇经历了一次网状进化事件。我们的结果表明，要么这些分类群仍在分子水平上进行分化，要么在最近经历了基因流动。
