Heterochromatic variation in Cebus apella (Cebidae, Platyrrhini) of different geographic regionsMatayoshi T. · Seuánez H.N. · Nasazzi N. · Nagle C. · Armada J.L. · Freitas L. · Alves G. · Barroso C.M. · Howlin E.
aCentro de Educación Médica e Investigaciones Clinicas Norberto Quirno, Buenos Aires, bDepartamento de Genética, Universidade Federal do Rio de Janeiro/Instituto Nacional do Cancer, Rio de Janeiro, cDepartamento de Genética, Universidade Federal da Bahia, dDepartamento de Genética, Universidade Federal do Pará
Different kinds of constitutive heterochromatin variation were observed in 72 specimens of Cebus apella, belonging to five distinct subspecies, captured in four geographic regions of South America. One particular chromosome type, affecting pair 19, was found to be exclusive of one subspecies (Cebus apella paraguayanus) and to have a distribution significantly different from that expected at equilibrium. Conversely, some other chromosome polymorphisms were more widespread, with distributions compatible with equilibrium. Other variant types, probably resulting from paracentric inversions involving both heterochromatin and euchromatin, were rarer and restricted to single specimens. Finally, a distinctive chromosome type 11 was found to be exclusive of one subspecies (Cebus apella xanthosternos), where it appeared as a fixed trait.
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