Chromosomal Relations in Two Species of Drosophila

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Abstract
The analysis of 1,341 individuals of D. guaramunu and 356 of D. griseolineata, all from natural populations of the state of Rio Grande do Sul, Brazil, shows that the former species is highly polymorphic with respect to gene arrangements in its chromosomes, while the latter species is not. Thus the 12 new inversions herein described in D. guaramunu brings to 31 the total number of inversions known in this species; yet the total for D. griseolineata remains at five, no new ones having been found. It is notable that 25 of the inversions of D. guaramunu occur in chromosome IV and 17 of these are localized in its basal half. Hybrid larvae, but no imagos, were obtained from a D. guaramunu female inseminated in nature by a D. griseolineata male. The salivary glands chromosomes of the hybrids confirmed that the greatest divergence by structural modification has occurred between chromosomes IV and V.

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