Cosmopolitan Inversions in Drosophila Ananassae

SUMMARYThe chromosomal analysis of various wild laboratory strains of Drosophila ananassae, a cosmopolitan domestic species, has shown that there is quantitative variation in the frequencies of different gene sequences occurring due to the cosmopolitan inversions. In some strains the chromosomes with inverted gene orders occur at frequencies higher than those of standard. The heterogeneity observed in the frequencies of a given gene arrangement among different strains seems to be due to the differences in allelic contents of the chromosomes. The results also reveal that there is an excess of inversion heterozygotes which in some strains reaches statistical significance. This indicates that the degree of heterosis may vary depending on the gene contents of the chromosomal variants. These results combined with those previously obtained clearly indicate that the pattern of chromosomal polymorphism in D. ananassae does not resemble that of other cosmopolitan species such as D. melanogaster, D. busckii and others.

[1]  Y. Inoue.  THE FATE OF POLYMORPHIC INVERSIONS OF DROSOPHILA MELANOGASTER TRANSFERRED TO LABORATORY CONDITIONS , 1979 .

[2]  Y. Inoue,et al.  INVERSION POLYMORPHISMS IN JAPANESE NATURAL POPULATIONS OF DROSOPHILA MELANOGASTER , 1979 .

[3]  B. Singh.  Quantitative variation of chromosomal polymorphism in natural populations of Drosophila ananassae. , 1974, Cytologia.

[4]  B. N. Singh.  On the Combinations of Different Gene Arrangements in the Third Chromosome of Drosophila Ananassae , 1974 .

[5]  Y. Tobari,et al.  Selective modes associated with karyotypes in Drosophila ananassae. II. Heterosis and frequency-dependent selection. , 1969, Genetics.

[6]  Y. Tobari,et al.  Selective modes associated with inversion karyotypes in Drosophila ananassae. I. Frequency-dependant selection. , 1967, Genetics.

[7]  Y. Tobari.  RELATION BETWEEN ADAPTIVE VALUES AND COMPOSITION OF THE POPULATION IN DROSOPHILA ANANASSAE , 1964 .

[8]  T. Dobzhansky.  Rigid vs. Flexible Chromosomal Polymorphisms in Drosophila , 1962, The American Naturalist.

[9]  Y. Tobari.  Heterosis Relating to a Terminal Inversion in Artificial Population of Drosophila ananassae , 1962 .

[10]  N. Freire‐Maia.  PECULIAR GENE ARRANGEMENTS IN BRAZILIAN NATURAL POPULATIONS OF DROSOPHILA ANANASSAE , 1961 .

[11]  H. Carson,et al.  Genetic conditions which promote or retard the formation of species. , 1959, Cold Spring Harbor symposia on quantitative biology.

[12]  H. Carson.  The genetic characteristics of marginal populations of Drosophila. , 1955, Cold Spring Harbor symposia on quantitative biology.

[13]  T. Dobzhansky,et al.  A FURTHER STUDY OF CHROMOSOMAL POLYMORPHISM IN DROSOPHILA WILLISTONI IN ITS RELATION TO THE ENVIRONMENT , 1954 .

[14]  T. Dobzhansky,et al.  ADAPTIVE CHROMOSOMAL POLYMORPHISM IN DROSOPHILA WILLISTONI , 1950 .

[15]  H. Burla,et al.  A Comparative Study of Chromosomal Polymorphism in Sibling Species of the Willistoni Group of Drosophila , 1950, The American Naturalist.

[16]  T. Dobzhansky,et al.  Chromosomal Aberrations in Brazilian Drosophila Ananassae. , 1943, Proceedings of the National Academy of Sciences of the United States of America.

[17]  B. Kaufmann.  A Terminal Inversion in Drosophila Ananassae. , 1936, Proceedings of the National Academy of Sciences of the United States of America.