Harshman L G, Prout T
Department of Entomology, University of California, Davis 95616.
Genetica. 1990;80(2):87-91. doi: 10.1007/BF00127128.
Drosophila pseudoobscura has three acrocentric autosomes. In the experiments reported, homologous arms of the third chromosome were attached to the same centromere. This is a 'reversed metacentric compound' third chromosome, denoted by C(3)RM. This compound chromosome is relatively fertile in within-strain crosses (ca. 50% egg hatch) but sterile when outcrossed to a normal karyotype. When constructing translocations for this experiment, the behavior of the Y-autosome translocations suggested that this species can tolerate more Y chromosome deficiency while retaining fertility than can Drosophila melanogaster. Finally, there were no Robertsonian exchanges observed among the 96 autosome-autosome translocations analyzed cytologically.
拟暗果蝇有三条近端着丝粒常染色体。在报道的实验中，第三条染色体的同源臂连接到了同一个着丝粒上。这是一条“反向中着丝粒复合”第三条染色体，用C(3)RM表示。这条复合染色体在品系内杂交时相对可育（约50%的卵孵化），但与正常核型杂交时不育。在构建本实验的易位时，Y - 常染色体易位的行为表明，与黑腹果蝇相比，该物种在保持生育力的同时能耐受更多的Y染色体缺失。最后，在细胞学分析的96个常染色体 - 常染色体易位中未观察到罗伯逊交换。
