Watabe H, Park J, Aotsuka T
Biological Laboratory, Sapporo College, Hokkaido University of Education, Japan.
Zoolog Sci. 1997 Oct;14(5):855-8. doi: 10.2108/zsj.14.855.
The karyotypes of the Drosophila robusta species-group, especially its species-subgroup okadai, were studied by using brain cell-Giemsa staining method. Drosophila gani possessed a diploid number of 12 chromosomes, comprising 4 pairs of metacentric, 2 pairs of acrocentric chromosomes, and both D. okadai and D. neokadai did 2n = 12, with 3 pairs of metacentrics, 2 pairs of acrocentrics and 1 pair of microchromosomes. The okadai subgroup characteristically retained a middle-sized acrocentric X chromosome, which implies that this subgroup may occupy an ancestral position for the robusta group.
利用脑细胞吉姆萨染色法对粗壮果蝇物种组，尤其是其冈田亚组的核型进行了研究。加纳果蝇的二倍体染色体数为12条，包括4对中着丝粒染色体、2对近端着丝粒染色体，而冈田果蝇和新冈田果蝇的二倍体染色体数均为2n = 12，有3对中着丝粒染色体、2对近端着丝粒染色体和1对微小染色体。冈田亚组的特征是保留了一条中等大小的近端着丝粒X染色体，这意味着该亚组可能在粗壮果蝇组中占据祖先位置。
