B-chromosomes in two Brazilian populations of Dendropsophus nanus (Anura, Hylidae)

AUTOR(ES)

Medeiros, Lilian R., Rossa-Feres, Denise C., Jim, Jorge, Recco-Pimentel, Shirlei M.

FONTE

Genetics and Molecular Biology

DATA DE PUBLICAÇÃO

2006

RESUMO

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.

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