Crosses were made between geographic races of Drosophila ananassas from different localities in India. All these strains employed in the present experiments were polymorphic for the gene arrangements in the second chromosome due to the occurrence of alpha (subterminal) inversion. After ten generations it was observed that the heterozygotes were the most superior genotype and their frequencies remained above fifty percent in all these strains which served as controls and in the hybrid populations of mixed geographic origin. Thus it was found that interracial hybridization does not lead to breakdown of heterosis. The chief conclusion from these experiments is that evidence for coadaptation is lacking in D. ananassae. This finding apparently conflicts with what has been claimed for other species.
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References
Brnčić, D. (1961). Integration of the genotypes in geographic populations of Drosophila pavani. Evolution 15: 92–97.
Dobzhansky, Th. (1950). Genetics of natural populations XIX. Origin of heterosis through selection in populations of Drosophila pseudoobscura. Genetics 35: 288–302.
Dobzhansky, Th. (1951). Genetics and the origin of species. Third Edition. Colombia Univ. Press, New York.
Bobzhansky, Th. (1954). Evolution as a creative process. Caryologia 6 (suppl.): 435–449.
Dobzhansky, Th. (1955). A review of some fundamental concepts and problems of population genetics. Cold Spring Harbor Symp. Quant. Biol. 20: 1–15.
Dobzhansky, Th. (1957). Mendelian populations as genetic systems. Cold Spring Harbor Symp. Quant. Biol. 22: 385–393.
Dobzhansky, Th. & A. Drevfus (1943). Chromosomal aberrations in Brasilian Drosophila ananassae. Proc. natn. Acad. Sci. (U.S.A.) 29: 301–305.
Dobzhansky, Th. & O. Pavlovsky (1958). Interracial hybridization and break-down of coadapted gene complexes in Drosophila paulistorum and Drosophila willistoni. Proc. natn. Acad. Sci. (U.S.A.) 44: 622–629.
Freire-Maia, N. (1955). In Discussion. Cold Spring Harbor Symp. Quant. Biol. 20: 270.
Freire-Maia, N. (1961). Feculiar gene arrangements in Brazilian natural populations of Drosophila ananassae. Evolution 15: 486–495.
Futch, D. G. (1966). A study of speciation in South Pacific populations of Drosophila ananassae. Univ. Texas Publ. 6615: 79–120.
Kaufmann, B. P. (1936). A terminal inversion in Drosophila ananassae. Proc. natn. Acad. Sci. (U.S.A.) 22: 591–594.
Kikkawa, H. (1938). Studies on the genetics and cytology of Drosophila ananassae. Genetica 20: 458–516.
Mayr, E. (1959). Where are we? Cold Spring Harbor Symp. Quant Biol. 24: 1–14.
Moriwaki, D. & Y. Nakajima (1958). Maternal effects on heterosis owing to an inversion in Drosophila ananassae. Proc. Xth. Int. Congr. Genet. 2: 194.
Moriwaki, D., M. Ohnishi & Y. Nakajima (1956). Analysis of heterosis in populations of Drosophila ananassae. Proc. Int. Genet. Symp., pp. 370–379.
Ray-Chaudhuri, S. P. & A. P. Jha (1966). Studies on salivary gland chromosomes of Indian Drosophila ananassae. Proc. Int. Cell Biol. Meet. Bombay, pp. 352–383.
Ray-Chaudhuri, S. P. & A. P. Jha (1967). Genetics of natural populations of Indian Drosophila ananassae. Nucleus 10: 81–89.
Shirai, M. & D. Moriwaki (1952). Variations of gene sequences in various strains of Drosophila ananassae. Dros. Inf. Serv. 26: 120–121.
Singh, B. N. (1970a). Studies on salivary gland chromosomes. Thesis, Banaras Hindu University, India.
Singh, B. N. (1970b). Distribution of most common inversions of Drosophila ananassae in different parts of India including Andaman and Nicobar Islands. Ind. Biol. 2: 78–81.
Singh, B. N. & S. P. Ray-Chaudhuri (1969). Geographic differentiation in natural populations of Drosophila ananassae. Abstr. IIIrd. Cell Biol. Conf. Delhi, p. 32.
SSingh, B. N. & S. P. Ray-Chaudhuri (1972). Balanced chromosomal polymorphism in experimental populations of Drosophila ananassae Doleschall. Ind. J. Exp. Biol. (In press).
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Singh, B.N. The lack of evidence for coadaptation in geographic populations of Drosophila ananassae . Genetica 43, 582–588 (1972). https://doi.org/10.1007/BF00115600
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DOI: https://doi.org/10.1007/BF00115600