Chromosomal Associations in Natural and Laboratory Populations of Drosophila ananassae

  • Pranveer Singh


Inversion polymorphism in Drosophila species provides a good material for analyzing epistatic interactions. Nonrandom associations between linked inversions are already reported in D. ananassae. In D. robusta nonrandom association (linkage disequilibrium) of linked inversions is attributed to two causative factors acting independently or together, viz., cross-over suppression between linked inversions and natural selection discriminating against certain recombinant arrangements. Meiotic drive is also implicated in causing linkage disequilibrium. In a study by Singh and Singh (Genetika 42:210–222, 2010), natural populations of D. ananassae and laboratory stocks initiated from these flies were used to study chromosome inversions. Quantitative data on inversion frequencies were employed to test intra- and interchromosomal associations in D. ananassae. In most of the populations (natural and laboratory), no significant departure from random combinations of chromosomes (2L–3L, 2L–3R, 3L–3R) were found, thus conforming random associations, although in some cases deviation from randomness was found to be statistically significant in natural as well as laboratory populations. This could be attributed to the increased number of some combinations, lesser number of others, and complete absence of certain combinations. Tight linkage between linked gene arrangements and genetic drift could have caused this. This corroborates the earlier hypothesis that genetic coadaptation is lacking in D. ananassae.


Linkage Disequilibrium Tight Linkage Laboratory Population Isofemale Line Chromosomal Association 
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© Springer India 2015

Authors and Affiliations

  • Pranveer Singh
    • 1
  1. 1.Department of ZoologyIndira Gandhi National Tribal UniversityAmarkantakIndia

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