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  • Title: Transmission Behavior of B Chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae).
    Author: Penitente M, Daniel SN, Senhorini JA, Foresti F, Porto-Foresti F.
    Journal: Cytogenet Genome Res; 2015; 147(2-3):179-85. PubMed ID: 26795613.
    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.
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