GENETIC DIFFERENTIATION AND INVERSION CLINES IN INDIAN NATURAL-POPULATIONS OF DROSOPHILA-MELANOGASTER
GENETIC DIFFERENTIATION AND INVERSION CLINES IN INDIAN NATURAL-POPULATIONS OF DROSOPHILA-MELANOGASTER
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作者：
DAS, A;SINGH, BN
为了研究印度黑腹果蝇自然居群的遗传分化和反转曲线，对14个自然居群（6个来自北方，8个来自南方）进行了染色体反转筛选。染色体分析发现23个旁中心反转，包括4个常见的世界性反转，4个罕见世界性反转，2个复发地方性反转，13个独特地方性反转（首次发现新的反转）。南方和北方群体的核型频率差异显著，南方群体的反转杂合性水平较高。在四种常见的世界性逆温与纬度之间发现了统计上显著的负相关。这些发现与世界其他地理区域的结果一致，表明印度黑腹龙种群在倒位多态性水平上发生了相当大的遗传分化。
To study the genetic differentiation and inversion clines in Indian natural populations of Drosophila melanogaster, 14 natural populations (6 from the north and 8 from the south) were screened for chromosome inversions. The chromosomal analysis revealed the presence of 23 paracentric inversions, which include 4 common cosmopolitan, 4 rare cosmopolitan, 2 recurrent endemic, and 13 unique endemic (new inversions detected for the first time) inversions. The difference in karyotype frequencies between populations from the north and south were highly significant and the level of inversion heterozygosity was higher in populations from the south. Statistically significant negative correlations were found between each of the four common cosmopolitan inversions and latitude. These findings are in accord with results from other worldwide geographic regions and show that Indian populations of D. melanogaster have undergone considerable genetic differentiation at the level of inversion polymorphism.