Sex chromosomes polymorphisms in Oryzomys aff. subflavus (Cricetidae, Rodentia) from Central Brazil

Abstract

Specimens of Oryzomys aff. subflavus collected in Central Brazil displayed a karyotype with 2n = 58 and FN = 70, not described previously. Sex chromosomes polymorphisms were identified: the X could be a large submetacentric (Xa), a large subtelocentric (Xb) or a large subtelocentric smaller than Xb (Xc) and the Y appeared as a medium submetacentric (Ya), a medium subtelocentric (Yb) or a medium acrocentric (Yc). G- and C-banding, as well as chromosomal measurements were used to establish the rearrangements involved in the sex chromosomes variability. © 1992 Taylor & Francis Group, LLC.