Heteromorphic sex chromosomes in Eupsophus insularis (Amphibia: Anura: Leptodactylidae).
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.
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Institute of Zoology, Universidad Austral de Chile, Valdivia, Chile.
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D000818:Animals; D001001:Anura / Q000235:genetics*; D002677:Chile; D002871:Chromosome Banding; D005260:Female; D007621:Karyotyping; D008297:Male; D008677:Metaphase; D012730:Sex Chromosomes / Q000737:chemistry*