Heteromorphic sex chromosomes inEupsophus insularis (Amphibia: Anura: Leptodactylidae)

descriptionPublicationkeyboard_double_arrow_right Article 01 Sep 1996 English Publisher:Springer Science and Business Media LLCJournal:Chromosome Research, volume 4, pages 467-470 (issn: 0967-3849, eissn: 1573-6849,

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Authors: C C, Cuevas; J R, Formas;

doi: 10.1007/bf02265054

pmid: 8889246

Heteromorphic sex chromosomes inEupsophus insularis (Amphibia: Anura: Leptodactylidae)

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Abstract

The chromosomes of the Chilean frog Eupsophus insularis are described for the first time. This species has a chromosome number of 2n = 30, and based on the karyotype it is concluded that E. insularis is closely related to E. migueli. E. insularis has an XX/XY system of sex determination, and pericentromeric constitutive heterochromatin is present in all chromosomes except in the Y chromosome. It is postulated that the Y chromosome is derived from a small ancestral metacentric chromosome that lost its heterochromatic segment.

Related Organizations

Austral University of Chile
Chile

Keywords

Male, Sex Chromosomes, Karyotyping, Animals, Female, Anura, Chile, Metaphase, Chromosome Banding

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