Aquino, C. I. [UNESP]Abril, V. V. [UNESP]Duarte, J. M B [UNESP]2014-05-272014-05-272013-09-13Genetics and Molecular Research, v. 12, n. 3, p. 3566-3574, 2013.1676-5680http://hdl.handle.net/11449/76557Deer species of the genus Mazama show significant inter and intraspecific chromosomal variation due to the occurrence of rearrangements and B chromosomes. Given that carriers of aneuploidies and structural rearrangements often show anomalous chromosome pairings, we here performed a synaptonemal complex analysis to study chromosome pairing behavior in a red brocket deer (Mazama americana) individual that is heterozygous for a Robertsonian translocation, is a B chromosome carrier, and has a multiple sex chromosome system (XY1Y2). The synaptonemal complex in spermatocytes showed normal chromosome pairings for all chromosomes, including the autosomal and sex trivalents. The electromicrographs showed homology among B chromosomes since they formed bivalents, but they also appeared as univalents, indicating their anomalous behavior and non-Mendelian segregation. Thus, synaptonemal complex analysis is a useful tool to evaluate the role of B chromosomes and rearrangements during meiosis on the intraspecific chromosomal variation that is observed in the majority of Mazama species. © FUNPEC-RP.3566-3574engB chromosomeCentric fusionCervidaeSynaptonemal complexXY1Y2Artigo10.4238/2013.September.13.1WOS:000331717400148Acesso aberto2-s2.0-848845728632-s2.0-84884572863.pdf