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At least 415 records · Page 23Linked to original sources
PubMed1972

Enzyme variability in the Drosophila willistoni group. IV. Genic variation in natural populations of Drosophila willistoni.

We describe allelic variation at 28 gene loci in natural populations of D. willistoni. Seventy samples were studied from localities extending from Mexico and Florida, through Central America, the West Indies, and tropical South America, down to South Brazil. At least several hundred, and often several thousand, genomes were sampled for each locus. We have discovered a great deal of genetic variation. On the average, 58% loci are polymorphic in a given population. (A locus is considered polymorphic when the frequency of the most common allele is no greater than 0.95). An individual fly is heterozygous, on the average, at 18.4% loci.-Concerning the pattern of the variation, the most remarkable finding is the similarity of the configuration of allelic frequencies from locality to locality throughout the distribution of the species. Our observations support the conclusion that balancing natural selection is the major factor responsible for the considerable genetic variation observed in D. willistoni.

Alleles↗
PubMed1974

Dosage compensation of genes on the left and right arms of the X chromosome of Drosophila pseudoobscura and Drosophila willistoni.

We have investigated the occurrence of dosage compensation in D. willistoni and D. pseudoobscura, two species whose X chromosome is metacentric with one arm homologous to the X and the other homologous to the left arm of chromosome 3 of D. melanogaster. Crude extracts were assayed for isocitrate dehydrogenase (XR), glucose-6-phosphate dehydrogenase (XL?), 6-phosphogluconate dehydrogenase (XL?), and alpha-glycerophosphate dehydrogenase (chromosome 2) in D. willistoni, and for esterase-5 (XR), glucose-6-phosphate dehydrogenase (XL?), 6-phosphogluconate dehydrogenase (XL?) and amylase (chromosome 3) in D. pseudoobscura. Our results indicate that a mechanism for dosage compensation is operative in both arms of the X chromosome of these two species.

Alleles↗
PubMedDate not supplied

Population genetics of Drosophila nasuta nasuta, Drosophila nasuta albomicana and their hybrids. VI. Pattern of meiotic F1 chromosome segregation.

Interracial hybridization experiments between D. n. nasuta and D. n. albomicana were made. During gametogenesis there was selective elimination of abnormal gametes in F1 females; hence, only normal gametes were produced. F1 males yielded both normal and abnormal gametes. Fertility tests on F2 and backcross progeny showed males are more often sterile than females. The implications of these findings are discussed.

Animals↗
PubMed1976

[Study of temperature-sensitive mutations in the virilis group of Drosophila. 4. Phenogenetics of a temperature-sensitive mutation affecting the development of imaginal discs in Drosophila virilis Sturt].

The phenogenetics of a new temperature-sensitive mutation diskless-ts (dl-ts, 2nd chromosome) has been studied in D. virilis. The rearing of larvae from the 1st instar at the temperature 31 degrees resulted in the complete or partial arrest of the development of imaginal discs and, consequently, the death of larvae prior to the pupation, at the prepupa stage. The change of temperature from 25 to 31 degrees during the second half of development in the 3rd instar affects the differentiation of imaginal discs. Some organs differentiate completely or partially (eyes, wings, legs) whereas the rest do not develop at all. The sensitive period embraces the whole larval development till the beginning of pupation.

Animals↗