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Cytological maps and chromosomal polymorphism of Drosophila polymorpha and Drosophila cardinoides

Cláudia Rohde; Vera Lúcia S, Valente

Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to V.L.S.V.

ABSTRACT

Four urban populations of the wild species Drosophila cardinoides and one of Drosophila polymorpha from Porto Alegre city, and one of each species from a natural control location (Eldorado do Sul), in Southern Brazil, were analyzed for the presence of paracentric inversions in their polytene chromosomes. Reference maps of the salivary gland chromosomes of both species were constructed and chromosomal polymorphism was recorded and qualitatively analyzed. In D. polymorpha populations, only one inversion was detected on chromosome arm IIR, whereas in D. cardinoides, despite the small size of the samples studied, four heterozygous inversions were identified on chromosome arm IIIL, plus the homozygous arrangement. Certain evolutionary implications of these findings are discussed.

Keywords: cytological maps; chromosomal polymorphism; Drosophila polymorpha; Drosophila cardinoides.

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