Cactus hosts Drosophila buzzatii 12 Cactaceae 10 Drosophila 10 Inversion polymorphism 6 Opuntia 6 body size 6 chromosome 6 polymorphism 6 Allozymes 4 Animals 4 Argentina 4 Body Constitution 4 Body size 4 Breeding 4 Chromosomal inversion 4 Diptera 4 Drosophilidae 4 Genetic structure 4 Inversion, Chromosome 4 Invertebrata 4 Karyotyping 4 Natural selection 4 Opuntia quimilo 4 Pyrus communis 4 Thorax 4 Trichocereus 4 Wing 4 Wing loading 4 allozyme 4