Abstract
Three closely related Drosophila species of the “obscura” group have been examined: Dropophila madeirensis, D. guanche and D. subobscura. Some crosses are possible between them and F1 progeny were used in order to clarify chromosomal homologies. D. madeirensis has the following constitution in relation to D. subobscura: Am+1; JST; O3; U1+2 while D. guanche has: Am+g; Jg; Eg; O3+g; U1+2 (where m and g indicate inversions specific to those species). Some data are also presented on the inheritance of eight different quantitative characters used by some taxonomists to differentiate other palearctic obscura group species.
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