[果蝇属（Sophophora）“virilis”组12个物种卵巢中初级多线染色体的组织]
[Organization of the primary polytene chromosome in the ovaries of 12 species of the "virilis" group of the genus Drosophila (Sophophora)].
作者信息
Stegniĭ V N, Vasserlauf I E, Anan'ina T V
出版信息
Genetika. 1996 Jun;32(6):750-4.
Organization of chromosomes was analyzed in ovarian nurse cells in 12 species of the virilis group of Drosophila. A diffuse chromocenter containing a clearly detectable block of heterochromatin was shown to be characteristic of the phylogenetically ancestral species D. virilis and D. kanekoi. Similar organization of chromosomes was observed in two daughter species, D. lummei and D. falvomontana. The chromocenter disappeared either completely or partially in the phylads montana and virilis, respectively. These species exhibited separate chromosomes attached to a nuclear envelope and dispersed within the nucleus. Detected alterations in chromosome architecture confirm evolutionary trends previously revealed in species of the melanogaster subgroup.
对果蝇属果蝇 virilis 组的 12 个物种的卵巢滋养细胞中的染色体组织进行了分析。一个含有明显可检测到的异染色质块的弥散性染色中心被证明是系统发育祖先物种果蝇 virilis 和果蝇 kanekoi 的特征。在两个子代物种果蝇 lummei 和果蝇 falvomontana 中观察到了类似的染色体组织。染色中心分别在 montana 和 virilis 亚属中完全或部分消失。这些物种表现出附着在核膜上并分散在细胞核内的独立染色体。检测到的染色体结构变化证实了先前在黑腹果蝇亚组物种中揭示的进化趋势。
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