Indian Journal of Scientific Research
Year : 2018, Volume : 8, Issue : 2
First page : ( 169) Last page : ( 176)
Print ISSN : 0976-2876. Online ISSN : 2250-0138.

Chromosomal variability due to inversions in Indian populations of Drosophila

Singh A. K.*

Genetics Laboratory Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India

*Corresponding author

Online published on 24 May, 2018.

Abstract

Every animal species possesses a fixed number of chromosomes which have their specific structural morphology. Changes in the chromosome structure may occur due to addition, deletion, inversion or translocation of a chromosome segment. Structural chromosomal aberrations can be distinctly spotted in the polytene chromosomes of Drosophila. One of the structural changes in the chromosomes is inversions, that occur very frequently in almost every species of Drosophila. Chromosomal markers like inversions, particularly paracentric inversions are very useful to know the level of genetic differentiation among different populations of a Drosophila species. A number of species of this genus have been chosen and analyzed for their chromosomal polymorphisms from all across the world and it has been inferred that persistence of inversions is due to their adaptive significance to the bearers. Indian population geneticists have also done ample work in this regard and have contributed substantially to the field of evolutionary genetics. Through the present article, it has been tried to review the work which have been accomplished by Indian workers with respect to chromosomal polymorphisms in different species of Drosophila, found in Indian subcontinent.

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Keywords

Drosophila, Chromosomal Polymorphism, Inversions, Indian Subcontinent.

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