Gruber, Simone LilianBaptista Haddad, Celio FernandoKasahara, Sanae2014-02-262014-05-202014-02-262014-05-202007-07-01Genetica. Dordrecht: Springer, v. 130, n. 3, p. 281-291, 2007.0016-6707http://hdl.handle.net/11449/20977The chromosomes of hylids Hypsiboas albopunctatus, H. raniceps, and H. crepitans from Brazil were analyzed with standard and differential staining techniques. The former species presented 2n = 22 and 2n = 23 karyotypes, the odd diploid number is due to the presence of an extra element interpreted as B chromosome. Although morphologically very similar to the small-sized chromosomes of the A complement, the B was promptly recognized, even under standard staining, on the basis of some characteristics that are usually attributed to this particular class of chromosomes. The two other species have 2n = 24, which is the chromosome number usually found in the species of Hypsiboas karyotyped so far. This means that 2n = 22 is a deviant diploid number, resulted from a structural rearrangement, altering the chromosome number of 2n = 24 to 2n = 22. Based on new chromosome data, some possibilities were evaluated for the origin of B chromosome in Hypsiboas albopunctatus, as well as the karyotypic evolution in the genus, leading to the reduction in the diploid number of 2n = 24 to 2n = 22.281-291engAg-NORBrdU incorporationC bandingfluorochrome stainingreplication bandingsupernumerary chromosomeArtigo10.1007/s10709-006-9105-6WOS:000247239100006Acesso restrito04580773990587628422327495725206