Data from: Individual inversions or their combinations: which is the main selective target in a natural population of Drosophila subobscura?

It is generally accepted that chromosomal inversions have been key
elements in adaptation and speciation processes. In this context, D.
subobscura has been, and still is, an excellent model species due to its
rich chromosomal polymorphism. In this species, many analyses from natural
populations have demonstrated the adaptive potential of individual
inversions (and their overlapped combinations, the so called
arrangements). However, little information is available on the
evolutionary role of combinations generated by inversions located in
homologous and non-homologous chromosomes. The aim of this research is to
ascertain whether these combinations are also a target for natural
selection. For this objective, we have studied the inversion composition
of homologous and non-homologous chromosomes from a D. subobscura sample
collected in a well-studied population, Mount Avala (Serbia). No
significant deviation from H-W expectations was detected, and when
comparing particular karyotypic combinations, likelihood ratios close to 1
were obtained. Thus, it seems that for each pair of homologous chromosomes
inversions no deviation from randomness was detected. Finally, no linkage
disequilibrium was observed between inversions located in different
chromosomes of the karyotype. For all these reasons it can be assumed
that, at the cytological level, the individual inversions rather than
their combinations in different chromosomes are the main target of
selection.