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Further evidence for early sex chromosome differentiation of Anuran species

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Abstract

Chromosome banding and meiotic evidence show that XX/XY systems found in two Eupsophus species (Amphibia-Leptodactylidae) represent early stages of sex chromosome differentiation. Pair 14 is heteromorphic in E. migueli males and represents the heterochromosomes. In E. roseus this pair is metacentric and does not show heteromorphism. Paracentromeric constitutive heterochromatin is present in all chromosomes except in the E. migueli and E. roseus metacentric Y chromosomes. Constitutive heterochromatin loss is the structural modification responsible for Y chromosome differentiation. Pericentric inversions may have modified the morphology of the X chromosome of Eupsophus species.

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Authors
  1. P. Iturra
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  2. A. Veloso
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Additional information

Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile

Departamento de Biología Celular y Genética, Facultad de Medicina, Universidad de Chile

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Iturra, P., Veloso, A. Further evidence for early sex chromosome differentiation of Anuran species. Genetica 78, 25–31 (1986). https://doi.org/10.1007/BF00058671

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  • DOI: https://doi.org/10.1007/BF00058671

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