Morphological Differences Between Two Sibling Species, Drosophila Pseudoobscura and Drosophila Persimilis

Morphological differences between two sibling species; Drosophila pseudoobscura and Drosophila persimilis.

Genetics of Sexual Isolation between DROSOPHILA PSEUDOOBSCURA and DROSOPHILA PERSIMILIS.

OTWITHSTANDING their morphological similarity, Drosophila pseudoN obscura and Drosophila persimilis are distinct species. No hybrids between them have been recorded in natural populations, although the two species frequently occur together in the same habitats. Although in laboratory experiments species hybrids may be obtained without much difficulty, intraspecific matings succeed more easily t...

Genetic Variation for Dispersal by DROSOPHILA PSEUDOOBSCURA and DROSOPHILA PERSIMILIS.

Release-recapture experiments using Drosophila pseudoobscura and D. persimilis strains of different karyotypes were performed in a heterogeneous environment. The heterogeneity was due to both spatial variation and the species of yeast used to attract the released flies. No karyotypic-specific habitat preferences were detected. However, in all releases, different strains did behave differently w...

Isolating Mechanisms Be- Tween Drosophila Pseudoobscura and Drosophila Persimilis

* Fellow in the Medical Sciences of the National Research Council. 1 Anderson, E. H., these PROCEEDINGS, 30, 397-403 (1944). 2 The asparagine medium consisted of: I-asparagine 0.2 per cent, dextrose 0.4, per cent, Na2HPO4 (anhydrous) 0.6 per cent, KH2P04 0.3 per cent, MgSO4 0.005 per cent, NaCl 0.005 per cent, glass distilled water. a The ammonium medium consisted of: NH4Cl 0.1 per cent, dextro...

Distinctions among allelic variants associated with chromosome 3 inversions in Drosophila pseudoobscura and Drosophila persimilis.

Efforts were made to discriminate new genetic variants among electrophoretic alleles that are associated with chromosome 3 inversions of Drosophila pseudoobscura and D. persimilis. Apparent genetic similarities for electrophoretic alleles between these two species and among the common inversions they carry were reexamined by altering gel concentration and buffer pH. At the amylase locus, the 1....