The Relation of an Inversion System to Recombination in Wild Populations

Epling, Carl; Mitchell, Donald F.; Mattoni, R. H. T.

doi:10.2307/2406052

Cited by 9 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dobzhansky (1943Dobzhansky ( , 1947a found that natural selection was present in at least two of three St. Jacinto (California) populations that he examined, because of seasonal changes in chromosomal rearrangements. Similar cyclic changes have also been recorded for D. funebris populations Tiniakov, 1945, 1946) and other Drosophila species (Dobzhansky et al, 1964;Epling et al, 1957). These changes cannot have been caused by genetic drift, because they were cyclic and followed the seasonal changes every year.…”

Section: Introductionsupporting

confidence: 75%

Detection of stabilizing selection in favor of the Santa Cruz homokaryotype in Drosophila pseudoobscura populations from the high plateau of the Colombian Andes

Álvarez¹,

Ruiz‐García²,

Guerrero³

et al. 2002

Genet. Mol. Res.

View full text Add to dashboard Cite

Chromosome 3 rearrangements were studied in five Drosophila pseudoobscura populations from the high plateau of the Colombian Andes. As in previous studies, the Santa Cruz and Tree Line rearrangements were predominant in these populations, but for the first time other rearrangements such as the Olympic, Cuernavaca and a rearrangement similar to the endemic Mexican Amecameca rearrangement were also discovered. Researchers in the early 1960's showed that Colombian D. pseudoobscura populations were not in accordance with Carson's theory. They found a special heterotic system in this geographically isolated population. Our current results do not support these findings but instead favor Carson's theory, because in practically all the populations studied the homokaryotype excess was close to fixation. These new results indicate that some stabilizing selective pressures in favor of the homokaryotypes (especially Santa Cruz) have appeared in the Colombian plateau during the last 10-12 years. These new changes may be related to deforestation and habitat destruction by human beings and/or climatic changes motivated by the El Niño phenomenon. Genetic heterogeneity between populations was not significant and there was no isolation-by-distance between them, findings which are contrary to those observed in some North American populations and which show that the Colombian populations now have rigid genetic systems. The frequency of the Santa Cruz rearrangement

show abstract

Section: Introductionsupporting

confidence: 75%

Detection of stabilizing selection in favor of the Santa Cruz homokaryotype in Drosophila pseudoobscura populations from the high plateau of the Colombian Andes

Álvarez¹,

Ruiz‐García²,

Guerrero³

et al. 2002

Genet. Mol. Res.

View full text Add to dashboard Cite

show abstract

“…In California, the localities sampled also contrast sharply: Pinon Flat, facing the Sonoran desert, has a flora characteristic of semidesert conditions (details in Epling et al, 1957). Other localities, such as Keen Camp, Wildrose, and others are in the transitional life zone.…”

Section: Methodsmentioning

confidence: 99%

“…7. Vandeventer Flat (VF), in the saddle between the San Jacinto and Santa Rosa mountains, southern California (see Epling et al, 1957, for A detailed description of the ecological conditions of each locality is not necessary, but an idea may be given of the range of habitats by comparing some of the localities in Arizona and in California. In Arizona, Betatakin is in an arid belt high on the Colorado plateau, receiving a precipitation of nine inches per year.…”

Section: Methodsmentioning

confidence: 99%

Morphological Variation in Natural and Experimental Populations of Drosophila pseudoobscura and Drosophila persimilis

Sokoloff¹

1966

Evolution

View full text Add to dashboard Cite

Drosophila pseudoobscura and its sibling D. persimilis are two species of fruit flies which have received considerable attention from the standpoint of population genetics. Examination of the arrangements (inversions) in the third chromosome in salivary gland cells of the larval progeny of flies derived from many geographic localities throughout the distribution of these species reveals that (1) populations within a locality are largely polymorphic; (2) populations from different altitudes and latitudes differ in the frequency of chromosomal arrangements; (3) the frequency of these arrangements varies from season to season; and (4) there are secular changes in the frequency of these inversions (see Dobzhansky, 1951, p. 138, for map showing frequency of the different inversions in D. pseudoobscura through most of its distribution, and Dobzhansky et al., 1964, for the most recent survey of inversion frequencies in this species).Laboratory studies showing that the frequency of these inversions is modified through natural selection and manipulation of environmental conditions are too numerous to mention (review in Strickberger, 1963). A few of these studies (for example, Beardmore et al., 1960;Tantawy, 1961) have combined the use of inversions and quantitative traits to measure the relative fitness of different gene arrangements under different constant and fluctuating temperatures, and one study (Druger,

show abstract

“…Natural selection was first implicated when Dobzhansky (2) showed that the frequencies of certain gene arrangements went through seasonal cycles in two of three populations on Mt. San Jacinto in California; subsequent studies showed that these cycles were repeated in years scattered over a span of 2 decades (3,4). The frequencies of gene arrangements in the third population on Mt.…”

mentioning

confidence: 99%

Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

Anderson¹,

Levine²,

Olvera³

et al. 1979

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Gene arrangement frequencies were determined at two stages in the life history of Drosophila pseudoobscura taken from nature. Three po ulations in the central highlands of Mexico were each sampled twice during 1976.Gene arrangement frequencies were measured in adult males and in larvae that were the offspring of females collected at the same time. The adult males were in all likelihood a representative sample of those who fathered the larvae produced by the wild females. Differences in gene arrangement frequency between these two life stages should indicate the operation of natural selection. One-third of our comparisons of common gene arrangement frequencies in males and in larvae from the next generation were statistically significant, as were one-third of our comparisons of total frequency arrays in the two life stages. We consider the components of selection that could produce such frequency changes and reason that male mating success must be the major one. Gene arrangement frequencies in the Mexican populations fluctuate within wide bounds. Selection must act to retain the polymorphism in the face of this flux in gene arrangement frequencies, and we suggest that male mating success plays an important role. One of the early triumphs of ecological genetics was the demonstration that selection in nature could be intense-in fact, one or several orders of magnitude more powerful than the founders of population genetics imagined. No experimental system played a more important role in the analysis of selection than the chromosomal polymorphism for gene arrangements in Drosophila pseudoobscura. In this species a series of inversions on the third chromosome binds large blocks of genes together as units, just as though they were alleles of a single "supergene." Natural selection was first implicated when Dobzhansky (2) showed that the frequencies of certain gene arrangements went through seasonal cycles in two of three populations on Mt. San Jacinto in California; subsequent studies showed that these cycles were repeated in years scattered over a span of 2 decades (3, 4). The frequencies of gene arrangements in the third population on Mt. San Jacinto did not cycle, but between 1939 and 1946 they underwent a directional change that Dobzhansky (5) also ascribed to natural selection. Dobzhansky and Levene (6) then showed that karyotypic frequencies in eggs laid by wild females were generally in accord with Hardy-Weinberg expectations, but that frequencies in wild males were not. They concluded that the karyotypes suffered differential mortality during the transition from fertilized egg to adult fly. That selection on the D. pseudoobscura inversions occurred in nature seemed to be settled, and it was generally taken for granted that viability differences accounted for the major part of it.Some 20 years later, a series of papers by Prout (7-10) stimulated evolutionary biologists to pay greater attention to the various components to fitness. These components determine the separate bits of selection that operate at...

show abstract

The Relation of an Inversion System to Recombination in Wild Populations

Cited by 9 publications

References 5 publications

Detection of stabilizing selection in favor of the Santa Cruz homokaryotype in Drosophila pseudoobscura populations from the high plateau of the Colombian Andes

Detection of stabilizing selection in favor of the Santa Cruz homokaryotype in Drosophila pseudoobscura populations from the high plateau of the Colombian Andes

Morphological Variation in Natural and Experimental Populations of Drosophila pseudoobscura and Drosophila persimilis

Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

Contact Info

Product

Resources

About