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PubMed1975

Photobehavioral differentiation in natural populations of Drosophila pseudoobscura and Drosophila persimilis.

The photoresponses of natural populations of D. pseudoobscura and D. persimilis, occurring sympatrically, are measured in two environmental conditions ("at rest" and "disturbed"). Comparisons of the responses, intraspecifically and interspecifically, lead to the following conclusions. These must be considered within the confines of the operational nature of the measurement of laboratory photoresponses. (1) Within each species population, significant nonenvironmental differentiation has been allowed or produced by selection in the "at rest" photoresponse. No significant nonenvironmental differentiation is found in the photoresponse measured in a disturbed condition. (2) Within each species population, a higher mean "disturbed" photoresponse has been favored. The intensities or patterns of selection acting on these two photoresponses have differed such that more intrapopulation differentiation has been allowed or produced in the "at rest" photoresponse. (3) A higher mean photoresponse has been favored in D. persimilis for both conditions. The intensities or patterns of selection acting between these two species populations on the "at rest" photoresponse have differed such that more intrapopulation differentiation has been allowed or produced in D. persimilis. (4) Comparisons of this study with one on intraspecific and interspecific differentiation in wing length lead to the conclusion that the selective differences inferred above have acted at a level more specifically attuned to photobehavior.

Animals↗
PubMed1989

Differences in chromosome A arrangement between Drosophila madeirensis and Drosophila subobscura.

The proximal half of the A (= X) chromosome of D. madeirensis has a gene arrangement very similar to the A1 or A6 inversions found in D. subobscura. Polytene chromosome analysis of hybrids between D. madeirensis and strains of D. subobscura homozygous for such inversions shows, however, that D. madeirensis has a gene arrangement different from any known for D. subobscura. These results provide evidence for a greater differentiation of the X chromosome in these species than has previously been described; it seems that the X chromosome is the only one that has undergone structural variation during the speciation process.

Animals↗
PubMed1982

Crossing-over in the female hybrids between Drosophila simulans and Drosophila mauritiana.

The cross between D. simulans and D. mauritiana yields fertile hybrid females. Crossing-over occurs in such female hybrids. This system allows the transfer of pieces of chromosomes from one species into another, thus providing an experimental tool to analyze the genetic basis of evolutionary problems, as well as the regulation of gene expression during development.

Animals↗
PubMed1976

The effect of caffeine on repair systems in oocytes of Drosophila melanogaster. III. Genetic analysis of factors controlling maternal repair in a repair-deficient strain of Drosophila melanogaster.

Genetic analysis was performed to locate the factors involved in the defective repair mechanism in the oocytes of Ubx e4/Payne ca females. The results demonstrate that at least three third-chromosome factors may be involved in the control of maternal repair, the two most effective ones being located on the right arm of the third chromosome, one near the Ubx locus and the other near the ca locus.

Animals↗