【摘要】 取果蝇脑神经节细胞,采用Giemsa染色的方法研究了我国某些地区,如北京、保定、青岛、大连、上海、梓潼的Ⅲ金色果蝇和杭州的金色果蝇的核型,并与来自日本的金色果蝇进行比较。所有材料都显示了基本相似的中期核型:2n=8,2V+1J+1D（即V形,J形,D点状）。各对染色体之间在形态上可以区别,大多数的材料显示次缢痕。但应特别指出的是,杭州金色果蝇H₂-Ⅲ品系的雄性完全缺失Y染色体,属于“XO型”性别决定。在复合种内的Y染色体及第Ⅳ染色体的中期染色体结构上存在着广泛而又重要的差别,这种差别是由于它们存在的异染色质含量的不同。更多还原

【Abstract】 Metaphase chromosome configurations of 8 areas of Drosophila auraria complex spi-eces were examined.By the Giemsa staining method,all materials showed similar basia pattern of metaphase karyotype.They are 2n=8,2V+1J+1D (V-shape,J-shape,D-Dot-Like).According to these morphological differences,each of these chromosomes could be distinguished from the other.The "secondary constrictions" were also seem almost in all the materials.It was found that the male flies of the D.auraria H1-Ⅲ stock from Hangzhou the X chromosme does not have a synoptic mate as the metaphase divisional figures (plate 1,C) of the larval brain cells showed a lack of Y chromosome.The male of this stock therefore belongs to the "XO type" of sex determination (plate 1,D).Among the extensive variations of the karyotype of different species the most important ones in the interspecific metaphase chromosomes configurations that had been observed lay in the Y and 4th (Dot-like) chromosomes.This fact make us consider that interspecific karyotype of D.auraria complex species differentiation is largely due to the presence or absence of different amounts of heterochromatin,更多还原