摘要
本研究发现银额果蝇昆明群体有丝分裂中期核型中存在B染色体,出现频率为69.1％。目前,在已研究过的来自各个地区的银额果蝇中,昆明群体的B染色体频率最高。B染色体数目为1—6条。该群体内单雌系间的B染色体数目不同,个体间和细胞间的B染色体数目也不同。在核型中,B染色体最小,形态稳定,点状,C-带和G-带呈阳性。
In this study, mitotic metaphase of Drosophila albomicans with B-chro-mosomes were found in Kunming population. Their frequency of presence of B-chromosomes were 69.1%. At present, among D. albomicans has been studied from several localities, the frequency of B-chromosomes of Kunming population were the hightest. The number of B-chromosomes varied from 1 to 6 and differed between each iso-femals line of them as well as that of between individuals and cells.
All the B-chromosomes were the smallest, dot-shaped of the karyotype. Both C-band and G-band staining are positive for B-chromosomes.
基金
日本国文部省国际学术研究基金(No.63043060
代表者北川修)
关键词
银额果蝇
昆明群体
B染色体
Drosophila albomicans, B-chromosome, Kunming population
