B-chromosomes in two Brazilian populations of Dendropsophus nanus (Anura, Hylidae)
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Graduate program
Undergraduate course
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Publisher
Sociedade Brasileira de Genética
Type
Article
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Acesso aberto
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Abstract
We report on the presence of B-chromosomes in two populations of Dendropsophus nanus (= Hyla nana Boulenger, 1889) from São Paulo State, Brazil. Such chromosomes were observed in 4 out of 43 specimens (9.3%) and in 9 out of 15 specimens (60%) from the municipalities of Nova Aliança and Botucatu, respectively. The karyotype 2n = 30 + 1B found in D. nanus was similar to that of other species with 2n = 30 chromosomes, except for the presence of an additional small telocentric chromosome. In one specimen from Botucatu, cells with one to three extra chromosomes were observed. These B-chromosomes appeared as univalent in meiosis I and did not bear a nucleolar organizer region or exhibit constitutive heterochromatin.
Description
Keywords
Anura, b-chromosome, Cytogenetic, Dendropsophus, supernumerary chromosome
Language
English
Citation
Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 29, n. 2, p. 257-262, 2006.
