Increased B chromosome frequency and absence of drive in the fish Prochilodus lineatus
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Data
1997-11-01
Autores
Oliveira, Claudio [UNESP]
Rodrigues Saboya, Silvia Maria [UNESP]
Foresti, Fausto [UNESP]
Senhorini, José Augusto [UNESP]
Bernardino, Geraldo [UNESP]
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Resumo
The neotropical freshwater fish species Prochilodus lineatus (Pisces, Prochilodontidae) shows 2n = 54 chromosomes plus supernumerary microchromosomes ranging in number from zero to seven among different animals. The transmission rates of B chromosomes were studied by the analysis of the parental and F1 generations in 10 controlled crosses performed with specimens from a natural population. The mean transmission rate observed for B chromosomes (k(B) = 0.511) was consistent with that expected from a regular meiotic behaviour orbs in both sexes and with the theoretical value under a Mendelian mode of transmission (0.5). Possible explanations for the dramatic increase in B frequency observed in this population during the last 10 years are discussed, bearing in mind the current absence of drive.
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B chromosome evolution, B chromosomes inheritance, Fish cytogenetics, Supernumerary chromosomes, Prochilodus lineatus
Como citar
Heredity, v. 79, n. 5, p. 473-476, 1997.