Population genetics of Drosophila ananassae: genetic differentiation among Indian natural populations at the level of inversion polymorphism

Genetical Research
Pranveer Singh, B N Singh

Abstract

The present study, which is one of the longest temporal (two decades) and largest spatial (different parts of India covered) investigations on inversion polymorphism in natural populations of D. ananassae, was undertaken to understand the dynamics of inversion polymorphism in a broad and comprehensive manner. Forty-five natural populations from different ecogeographic regions of the country (covering the regions from Kashmir to Kanniyakumari and Gujarat to Nagaland) were analysed for chromosomal inversions. All the populations show the presence of the three cosmopolitan inversions, frequencies of which vary among the populations analysed. Simple correlations between frequencies of different inversions and regression analysis of inversion frequencies with latitude, longitude and altitude were insignificant. This reinforces the concept of rigid polymorphism in D. ananassae. Genetic divergence (spatial and temporal) at the level of chromosomal polymorphism among natural populations was calculated. Results show spatial divergence but no temporal divergence. Rigid polymorphic systems of D. ananassae did not show long-term directional trends. On the basis of the present study, and after including comparisons with the studies conducte...Continue Reading

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Citations

Dec 9, 2008·Genetics Research·Pranveer Singh, Bashisth N Singh
Dec 23, 2015·Journal of Genetics·B N Singh, J P Yadav
Jul 1, 2017·Molecular Genetics and Genomics : MGG·Sujata Mohanty, Radhika Khanna

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