title: Transmission Behavior of B Chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae).
abstract: The population of Prochilodus lineatus found in the Mogi-Guaçu River is karyotypically polymorphic, carrying acrocentric, metacentric, and submetacentric B chromosomes. The analysis of each B chromosome frequency in this species revealed a variation in the distribution pattern, with the metacentric type having the highest frequency (73.30%), followed by submetacentric (25.22%) and acrocentric B chromosomes (1.48%). The transmission pattern of the supernumerary chromosomes was identified by controlled crosses, and it was shown that the acro- and submetacentric B chromosomes have a transmission pattern below the Mendelian rate (kB = 0.333 and kB = 0.385, respectively), but the metacentric variant has a cumulative transmission pattern (kB = 0.587). These results indicate that the acro- and submetacentric B chromosomes are undergoing an extinction process, while the metacentric B chromosomes appear to be accumulating in frequency with each generation.
authors.affiliation: Departamento de Cix00EA;ncias Biolx00F3;gicas, Faculdade de Cix00EA;ncias, Universidade Estadual Paulista (UNESP), Campus de Bauru, Bauru, Brazil.
authors.forename: Manolo
authors.initials: M
authors.lastname: Penitente
authors.forename: Sandro N
authors.initials: SN
authors.lastname: Daniel
authors.forename: José A
authors.initials: JA
authors.lastname: Senhorini
authors.forename: Fausto
authors.initials: F
authors.lastname: Foresti
authors.forename: Fábio
authors.initials: F
authors.lastname: Porto-Foresti
mesh_terms: D000818:Animals; D001938:Brazil; D001947:Breeding / Q000379:methods*; D002503:Centromere / Q000235:genetics; D060125:Characiformes / Q000145:classification / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics*; D020732:Cytogenetic Analysis; D005260:Female; D005398:Fisheries / Q000379:methods; D005828:Genetics, Population / Q000379:methods; D040582:Inheritance Patterns; D008297:Male; D045483:Rivers; D013045:Species Specificity