Nucleolar organizer regions as markers of chromosomal polymorphism in Apareiodon affinis (Pisces, Parodontidae)

Autor:	Orlando Moreira Filho, Lilian Cristina Jorge
Rok vydání:	2004
Předmět:	Genetics medicine.medical_specialty Cytogenetics Biology biology.organism_classification Apareiodon affinis Polymorphism (computer science) Parodontidae medicine Chromosomal polymorphism 18s rdna Ploidy Nucleolus organizer region General Agricultural and Biological Sciences
Zdroj:	Caryologia. 57:195-199
ISSN:	2165-5391 0008-7114
DOI:	10.1080/00087114.2004.10589392
Popis:	Specimens of Apareiodon affinis collected from four sites of the Parana River (called Lower Parana, Argentina) were analyzed. This species presents a diploid number of 54 chromosomes, without any apparent sex chromosomal heteromorphism. However, it was possible to verify the occurrence of 10 cytotypes, some of them common to all collected sites, characterizing an structural chromosomal polymorphism. Data obtained from chromosomal banding methods, results further suggest an inter-individual NOR polymorphism. Such variation is possibly caused by pericentric inversions and other chromosomal rearrangements. The 5S rDNA was separated from 18S rDNA clusters, these cistrons seems to present variation, suggesting that other chromosomes could also be involved in the polymorphism. The results obtained confirmed the structural polymorphism in A. affinis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9a4c9e2c9f3a7f134f126b7cb5bbc0b7 https://doi.org/10.1080/00087114.2004.10589392 Zobrazit plný text záznamu