Karyological heterogeneity in the Falconiformes (aves)

@article{Boer2006KaryologicalHI,
  title={Karyological heterogeneity in the Falconiformes (aves)},
  author={Leobert E. M. de Boer},
  journal={Experientia},
  year={2006},
  volume={31},
  pages={1138-1139}
}
  • L. Boer
  • Published 15 October 1975
  • Biology
  • Experientia
Chromosome studies in 4 families of Falconiformes, Cathartidae, Falconidae, Sagittariidae and Accipitridae showed that the karyological variety in this order is much wider than in any other avian order, which underlines the heterogeneous character of the group. Of the 4 families only the Cathartidae show karyological similarities with other avian groups (Gruiformes, Ciconiiformes), while the karyotypes of the Accipitridae are most uncommon among birds, because of the presence of only 8… 
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TLDR
In all birds examined the female heterogametic sex has two heterochromosomes ZW, and the distribution of the haploid number frequencies is not normal, it is postulated that there are some factors limiting the random scattering of the values.
Chromosomal uniformity in the avian subclass Carinatae
TLDR
Class Aves, subclass Carinatae, constitutes an independently uniform class with regard to the total chromosome area and the absolute size of the Z-chromosome.