Genetics and Molecular Biology | |
B-chromosomes in two Brazilian populations of Dendropsophus nanus (Anura, Hylidae) | |
Lilian R. Medeiros2  Denise C. Rossa-feres1  Jorge Jim1  Shirlei M. Recco-pimentel2  | |
[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de Biologia CelularCampinas SP ,Brazil | |
关键词: Anura; b-chromosome; cytogenetics; Dendropsophus; supernumerary chromosome; | |
DOI : 10.1590/S1415-47572006000200010 | |
来源: SciELO | |
【 摘 要 】
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.
【 授权许可】
CC BY
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