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題名 | Chromosomal Inversion Polymorphism in Natural Populations of Drosophila Ruberrima=暗黑大果蠅族群之染色體逆位多態性 |
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作者 | 方淑; 林飛棧; 張慧羽; Fang, Shu; Lin, Fei-jann; Chang, Hwei-yu; |
期刊 | 動物研究學刊 |
出版日期 | 19981000 |
卷期 | 37:4 1998.10[民87.10] |
頁次 | 頁309-321 |
分類號 | 387.795 |
語文 | eng |
關鍵詞 | 暗黑大果蠅; 遺傳分化; 遺傳變異; 染色體逆位多態性; Drosophila ruberrima; Genetic differentiation; Genetic variation; Inversion polymorphism; |
中文摘要 | 我們採取染色體逆位為指標探討大果蠅種群、大果蠅種亞群成員中的暗黑大果蠅 之族群結構。為方便染色體逆位多態性的研究,依據最原始的染色體序列構建了唾液腺巨大 染色體標準圖,並純化一個每條染色體臂都是同結合型的染色體純系。雄蟲染色體逆位的鑑 定根據與染色體純系雌蟲交配所產生的 F �答漪V色體型式,比對染色體標準圖, 加以判讀 。暗黑大果蠅的染色體逆位不論在種類及頻率上都呈現相當高的多態性。臺灣族群處於哈溫 平衡的狀態,然而雲南族群因自然選汰導致同結合型個體過多。處於分佈邊緣及島嶼的臺灣 族群的遺傳變異比雲南族群低。臺灣島內的亞族群之間幾乎沒有遺傳分化的現象,顯示基因 交流頻繁。而臺灣和雲南族群間則具明顯的遺傳的分化。 |
英文摘要 | The standard map of the giant polytene chromosome of Drosophila ruberrima, one of the members of the immigrans species subgroup of the immigrans species group, is constructed according to the primitive gene arrangement or standard sequence (ST) for each chromosome. A pure line with homozygous chromosomes was established. Chromosomal inversions can be identified easily by crossing a male fly with the pure line and checking the F �� with the aid of this standard map. Inversion polymorphism, both kinds and frequencies, of this species is high. The Taiwan population is at Hardy-Weinberg equilibrium, but the Yunnan population shows an excess of homozygotes which is probably affected by natural selection. The geographic pattern of chromosomal inversion polymorphism in natural populations reveals that the marginal island population, Taiwan, is less variable than the central mainland population, Yunnan, mainland China. Little genetic differentiation among subpopulations within Taiwan indicates that extensive gene flow exists. In contrast, moderate genetic differentiation was observed between the Taiwan and Yunnan populations. |
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