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Das, Aparup,Singh, B N 한국유전학회 1990 Genes & Genomics Vol.12 No.2
Inversion polymorphism in six Indian natural populations of Drosophila melanogaster was studied and nineteen different paracentric inversions including the four common cosmopolitans were detected. The description of inversion and their frequencies have been described elsewhere (Singh and Das, 1990a, Genome 33: in press). During the present study the same data have been analysed in order to test the infra-and interchromosomal interactions in Indian natural populations of D. melanogaster. The results provide no evidence for interactions between inversions in natural populations analysed.
Chromosomal Polymorphism in Indian Natural Populations of Drosophila Melanogaster
Das, Aparup,Singh, B N 한국유전학회 1991 Genes & Genomics Vol.13 No.2
Chromosomal polymorphism was studied in 28 natural populations and several laboratory stocks established from naturally impregnated females of Drosophila melanogaster from India. The chromosomal analysis revealed the presence of 42 paracentric inversions; 3 in the X-chromosome, 13 in 2L, 11 in 2R, 7 in 3L and 8 in 3R. All the four types of inversions; common cosmopolitan (4), rare cosmopolitan (4), recurrent endemic (7) and unique endemic (27) were found. One pair of overlapping inversions (3R) and one pair of included inversions (2L) were also detected during the present study. Description of all 42 inversions, their location in chromosomes, microphotographs, break points and geographical distribution are given collectively in this study. The breakpoints of inversions are randomly distributed in all the chromosomal arms. All these findings are in agreement with previous reports from other countries and suggest that Indian populations of D. melanogaster are highly polymorphic chromosomally.
Heterosis Associated with Chromosome Inversions in Drosophila Bipectinata
Das, Aparup,Singh, B N 한국유전학회 1992 Genes & Genomics Vol.14 No.3
Strains of Drosophila bipectinata established from mass cultures using naturally impregnated females were maintained in the laboratory for more than twenty generations by transferring nearly fifty flies (females and males in equal numbers) to fresh food bottles in each generation. After the stocks were maintained for more than twenty generations, they were analysed for chromosome inversions. Three autosomal paracentric inversions (one in 2L, one in 2R and one in 3L) were detected and four stocks (Nepal, Varanasi, Kerala and Mysore) showed the presence of inversions. The inversions In D (2L) and In C (2R) were more common and were maintained at a considerable frequency. Furthermore, there was a significant excess of inversion heterozygotes in all the stocks containing these inversions. The persistence of chromosomal polymorphism in laboratory stocks for more than twenty generations and a significant excess of inversion heterozygotes suggest that naturally occurring inversion heterozygotes in D. bipectinata exhibit heterosis.
Genetic Polymorphisms in VIR Genes among Indian Plasmodium vivax Populations
Purva Gupta,Veena Pande,Aparup Das,Vineeta Singh 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.5
The vir genes are antigenic genes and are considered to be possible vaccine targets. Since India is highly endemic to Plasmodium vivax, we sequenced 5 different vir genes and investigated DNA sequence variations in 93 single-clonal P. vivax isolates. High variability was observed in all the 5 vir genes; the vir 1/9 gene was highly diverged across Indian populations. The patterns of genetic diversity do not follow geographical locations, as geographically distant populations were found to be genetically similar. The results in general present complex genetic diversity patterns in India, requiring further in-depth population genetic and functional studies.