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Further studies on polyploid amphibians (Ceratophrydidae)

III. Meiotic aspects of the interspecific triploid hybrid: Odontophrynus cultripes (2n=22) x O.americanus (4n=44)

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Abstract

Meiosis and sex-ratio of artificial interspecific triploid hybrids (3n=33) produced by mating of Odontophrynus cultripes males (2n=22) with O.americanus females (4n=44) are described. — Metaphases I from the triploids show pairing of homologues in configurations of trivalents, bivalents and univalents. Metaphases II revealed a variation of chromosome numbers in the range of 11 to 22. Buploid gametes with 11, 22 and 33 dyads were also found. The latter (3n) arose by pre-meiotic duplication of the chromosomes and/or by absence of meiotic reduction. — Sex-ratio of 1∶1 males to females in one sample of the triploid interspecific hybrids was obtained.

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Authors and Affiliations

  1. Serviço de Genética, Institute Butantan, São Paulo, Brasil

    Maria Luiza Beçak & Willy Beçak

Authors
  1. Maria Luiza Beçak
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  2. Willy Beçak
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This work was supported by U. S. Public Health Service grant GM-14577-03 from the National Institute of General Medical Sciences, by the Fundo de Pesquisas de Instituto Butantan and by the Conselho Nacional de Pesquisas.

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Beçak, M.L., Beçak, W. Further studies on polyploid amphibians (Ceratophrydidae). Chromosoma 31, 377–385 (1970). https://doi.org/10.1007/BF00285829

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  • DOI: https://doi.org/10.1007/BF00285829

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