, Volume 78, Issue 1, pp 25–31 | Cite as

Further evidence for early sex chromosome differentiation of Anuran species

  • P. Iturra
  • A. Veloso


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.


Structural Modification Chromosome Banding Chromosome Differentiation Pericentric Inversion Constitutive Heterochromatin 
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© Kluwer Academic Publishers 1989

Authors and Affiliations

  • P. Iturra
  • A. Veloso

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