Karyotype description and evidence of multiple sex chromosome system X1X1X2X2/X1X2Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil
| Autor: | Vanessa Paes da Cruz, Cristiane Kioko Shimabukuro-Dias, Claudio Oliveira, Fausto Foresti |
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| Jazyk: | angličtina |
| Předmět: | |
| Zdroj: | Neotropical Ichthyology, Vol 9, Iss 1, Pp 201-208 |
| Druh dokumentu: | article |
| ISSN: | 1982-0224 1679-6225 |
| DOI: | 10.1590/S1679-62252011000100020 |
| Popis: | Cytogenetic analysis of Potamotrygon aff. motoro and P. falkneri indicated the occurrence of an X1X1X2X2/X1X2 Y multiple sex chromosome system in both species, with 2n = 66 chromosomes for females and 2n = 65 chromosomes for males. The nucleolus organizer regions (NORs) identified using Ag-NOR technique showed that both species have multiple Ag-NORs (5 to 7 chromosomes stained). C-banding technique indicated the presence of heterochromatic blocks in the centromeric regions of almost all chromosomes in both species. Through this study there was evidence of heterogeneity in the karyotypes, which suggests that chromosomal rearrangements such as inversions and/or translocations occurred during the chromosomal evolution in two species of this genus. |
| Databáze: | Directory of Open Access Journals |
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