Full text in pdf format

Linkage disequilibrium between chromosomal inversions of Drosophila mercatorum pararepleta (Diptera, Drosophilidae)

Nilda Maria Diniz; Fábio de Melo Sene

Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, USP, 14049-900 Ribeirão Preto, SP, Brasil. Send correspondence to F.M.S.

ABSTRACT

Linkage disequilibrium (LD) in a lab population of Drosophila mercatorum pararepleta was analyzed through an investigation of the recombination rate between inversions. Inversions 5a² and 5b² of chromosome five were in total LD, with a null rate of recombination, as has been found for natural populations. The inversions of chromosome 2-3F presented a low rate of recombination between arrangements, 2s³-3n (0.89%) and 2s³-3g (2.5%) and null between 3n-3g and 3g-3h. The data suggest that casual adaptation of inversions are a consequence of disequilibrium and not a cause of it.

Keywords: linkage disequilibrium; chromosomal inversions; Drosophila mercatorum pararepleta.

REFERENCES

Brncic, D. (1961). Non random associations of inversions in D. pavani. Genetics 46: 401-406.

Carson, H.L. (1955). The genetic characteristics of marginal populations of Drosophila. Cold Spring Harbor Symp. Quant. Biol. 20: 276-287.

Carson, H.L. (1956). Marginal homozygosity for gene arrangement in Drosophila robusta. Science 123: 630-631.

Carson, H.L. (1965). Chromosomal morphism in geographically widespread species of Drosophila. In: The Genetic of Colonizing Species (Berker, H.G. and Stebbins, G.L., eds.). Academic Press, New York, pp. 508-531.

Hedrick, P., Jain, S. and Holden, L. (1978). Multilocus systems in evolution. Evolutionary Biology 11: 101-184.

Levitan, M. (1955). Studies of Linkage in Populations. I. Association of Second Chromosome Inversions in Drosophila robusta. Evolution 9: 62-74.

Levitan, M. (1958). Non random associations of inversions. Cold Spring Harb. Symp. Quant. Biol. 23: 251-268.

Levitan, M. and Salzano, F.M. (1959). Studies of linkage in populations. III. An extreme non random association of linked inversions in D. guaramunu. Heredity 13: 243-248.

Patterson, J.T. and Wheeler, M.R. (1942). Description of new species of the subgenera Hirtodrosophila and Drosophila. Univ. Texas Publ. 4213: 67-109.

Pereira, M.A.Q.R. (1979). Estudo da variabilidade genética em populações de Drosophila mercatorum pararepleta. Doctoral Thesis. Instituto de Biociências, Universidade de São Paulo.

Sene, F.M. (1986). Geographic and ecological pattern of chromosome polymorphism in Drosophila mercatorum pararepleta. Rev. Brasil. Genet. 9: 573-591.

Sene, F.M., Pereira, M.A.Q.R., Vilela, C.R. and Bizzo, N.M.V. (1981a). Influence of different ways to set baits for collection of Drosophila flies in the tree natural environments. D.1. S. 56: 118-121.

Sene, F.M., Amabis, J.M., Carson, H.L. and Cyrino, T.H.F.S. (1981b). Chromosomal polymorphism in Drosophila mercatorum pararepleta in South America. Rev. Brasil. Genet. IV: 1-10.

Tidon-Sklorz, R. and Sene, F.M. (1992). Vertical and temporal distribution of Drosophila (Diptera, Drosophilidae) species in wooded area in the state of São Paulo, Brazil. Rev. Bras. Biol. 52: 311-317.

Turner, J.R.G. (1967). Why does the genotype not congeal? Evolution 21: 645-656.

Vilela, C.R., Pereira, M.A.Q.R. and Sene, F.M. (1983). Preliminary data on geographical distribution of Drosophila species within morphoclimatic domains of Brazil. II. The repleta group. Ciênc. Cult. 35: 66-70.

Wasserman, M.C. (1962). Cytological studies of the repleta group of the genus Drosophila: The mercatorum subgroup. Univ. Texas Publ. 6205: 63-71.

Wasserman, H.L. (1982). The repleta species. In: Genetics and Biology of Drosophila (Ashbumer, M., Carson, H.L. and Thompson Jr., J.N., eds.). Vol. 3b. Academic Press, London, pp. 61-133.

Wharton, L.T. (1942). Analysis of the repleta group of Drosophila. Univ. Texas Pubis. 4228: 23-52.

Zouros, E. and Krimbas, C.B. (1973). Evidence for linkage disequilibrium maintained by selection in two natural popualtions of D. subobscura. Genetics 73: 659-674.