Abstract
Interracial hybridization between Drosophila nasuta nasuta (2n=8) and D. n. albomicana (2n=6) has resulted in the evolution of two new karyotypic strains, called “Cytoraces” I and II. Males and females of Cytorace I have 2n=7 and 2n=6 respectively. The reconstituted karyotype is totally new in its composition, the chromosomes being drawn from both the parental races. The individuals of Cytorace II have 2n=6. Even though the chromosomes of the parental races are duly represented in the F1, there is selective retention/elimination of certain chromosomes in the succeeding generations during which repatterning of the karyotype has taken place. Dynamics of each one of the parental chromosomes are presented and its implications re discussed.
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References
Dobzhansky Th, Ayala FJ, Stebbins GL, Valentine JW (1976) Evolution. W.H. Freeman and Company
Hägele K (1977) N-banding in polytene chromosomes of Chironomus and Drosophila. Chromosoma 63:79–88
Hägele K, Ranganath HA (1982) The chromosomes of two Drosophila races: D. nasata nasuta and D.n. albomicana. II. Differences in their microchromosomes. Chromosoma 85:215–220
Hägele K, Ranganath HA (1983) The chromosomes of two Drosophila races: D. nasuta nasuta and D. nasuta albomicana III. Localization of nucleolar organizer regions. Genetica 60:123–128
Mayr E (1963) Populations, species and evolution. The Belknap Press of Harvard University Press, Cambridge, Massachusetts and London, England
Nirmala SS, Krishnamurthy NB (1972) Drosophila albomicana: a race of Drosophila nasuta. Drosophila Inf Serv 49:60
Rajasekarasetty MR, Siddaveere Gowda L, Krishnamurthy NB, Ranganath HA (1979) Population Genetics of Drosophila nasuta nasuta, Drosophila nasuta albomicana and their hybrids. I. Karyotypic mosaicism in the hybrids. Genetics 93:211–215
Ranganath HA (1978) Population genetics of Drosophila nasuta nasuta, Drosophila nasuta albomicana and their hybrids. Proc Ind Natl Sci Acad (New Delhi) Science Academy Medals for Young Scientists, Lectures 124–139
Ranganath HA, Hägele K (1981) Karyotypic orthoselection in Drosophila. Naturwissenschaften 68:527–528
Ranganath HA, Hüagele K (1982) The chromosomes of two Drosophila races: D. nasuta nasuta and D. n. albomicana. I. Distribution and differentiation of heterochromatin. Chromosoma 85:83–92
Ranganath HA, Rajasekarasetty MR, Krishnamurthy NB (1974) Evolutionary status of Indian Drosophila nasuta. Ind J Hered 6:19–25
Ranganath HA, Schmidt ER, Hägele K (1982) Satellite DNA of Drosophila nasuta nasuta and D. n. albomicana. Localization in polytene and metaphase chromosomes. Chromosoma 85:361–368
Stock AD, Burnham DB, Hsu TC (1972) Giemsa banding of meiotic chromosomes with description of a procedure for cytological preparations from solid tissues. Cytogenetics 11:534–539
Sumner AT (1972) A simple technique for demonstrating centromeric heterochromatin. Exp Cell Res 75:305–306
Wakahama K, Kitagawa O, Yamaguchi O (1971) Evolutionary and genetical studies of Drosophila nasuta subgroup I chormosomal polymorphism found in the natural populations of Drosophila albomicana. Drosophila Inf Serv 46:144
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We dedicate this paper to the memory of the founder of our Department, the late Prof. M.R. Rajasekarasetty on the occasion of the Silver Jubilee of our Department
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Ramachandra, N.B., Ranganath, H.A. The chromosomes of two Drosophila races: D. nasuta nasuta and D. nasuta albomicana . Chromosoma 93, 243–248 (1986). https://doi.org/10.1007/BF00292744
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DOI: https://doi.org/10.1007/BF00292744