Das A, Mohanty S, Parida B B
Department of Zoology, Utkal University, Bhubaneswar, India.
Heredity (Edinb). 1994 Oct;73 ( Pt 4):405-9. doi: 10.1038/hdy.1994.188.
Five Indian natural populations of Drosophila ananassae were analysed for chromosome inversions and the presence of individuals with extra scutellar bristles in the F1 progeny of isofemale lines initiated from naturally impregnated females. Three commonly occurring inversions were found in these populations with varying frequencies as was the number of individuals with extra bristles (e.b.). Female individuals were more often found to carry extra scutellar bristles than were males. This result reveals that polygenic loci responsible for the determination of e.b. are widespread in Indian natural populations of D. ananassae. A significant positive correlation between the inversion frequency and the number of individuals with e.b. was detected in the isofemale lines of all the five populations. The 2L inversion, alpha, was found to be closely associated with individuals with the e.b. phenotype. The observed results are compared with earlier results obtained for D. melanogaster. The association of the alpha inversion with the e.b. phenotype is discussed in relation to chromosomal evolution in the melanogaster species group.
对印度五个自然果蝇种群进行了分析，研究其染色体倒位情况以及从自然受孕雌蝇建立的同雌系F1后代中具有额外小盾刚毛个体的存在情况。在这些种群中发现了三种常见的倒位，其频率各不相同，具有额外刚毛（e.b.）的个体数量也是如此。发现雌性个体比雄性个体更常携带额外的小盾刚毛。这一结果表明，负责决定e.b.的多基因位点在印度果蝇自然种群中广泛存在。在所有五个种群的同雌系中，检测到倒位频率与具有e.b.的个体数量之间存在显著的正相关。发现2L倒位，即α，与具有e.b.表型的个体密切相关。将观察结果与早期对黑腹果蝇获得的结果进行了比较。讨论了α倒位与e.b.表型的关联与黑腹果蝇物种组染色体进化的关系。
