tailieunhanh - Báo cáo sinh học: "Epistatic interaction between unlinked inversions in Indian natural populations of Drosophila melanogaster"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Epistatic interaction between unlinked inversions in Indian natural populations of Drosophila melanogaster | Genet Sei Evol 1991 23 371-383 Elsevier INRA 371 Original article Epistatic interaction between unlinked inversions in Indian natural populations of Drosophila melanogaster BN Singh A Das Centre of Advanced Study in Zoology Banaras Hindu University Genetics Laboratory Varanasi-221 005 India Received 29 October 1990 accepted 14 June 1991 Summary - Fourteen Indian natural populations 6 from the north and 8 from the south of Drosophila melanogaster were screened for chromosome inversions and 23 paracentric inversions including 4 common cosmopolitan In 2L t In 2R NS In 3L P and In 3R P 2 rare cosmopolitan In 3R Mo and In 3R C and a recurrent endemic In 3L IB found to be common in distribution were detected. Comparison of the observed and expected numbers via the Hardy-Weinberg equilibrium of different karyotypes produced by all these inversions each treated independently showed no significant deviation from expectation in any of the populations analysed. During the present investigation data on intra- and interchromosomal associations have been obtained to test chromosome interactions in Indian natural populations of D melanogaster. The results show that different associations between linked inversions of the second and third chromosomes occur randomly providing no evidence for epistatic interaction between linked inversions. Furthermore the majority of pairs of unlinked inversions of major autosomes also occur in random combinations. However highly significant non-random associations were found between In 2R NS and In 3R C in all the populations from south India and between In 2L t and In 3R P in 11 populations out of 14 analysed. There is a significant excess of individuals which are either doubly homozygous for ST standard at both unlinked inversion loci or doubly heterozygous indicating epistatic interactions between unlinked inversions in these populations. Drosophila melanosgaster inversion polymorphism epistatic interaction Indian populations Resume Interaction

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