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Conservation of the Original Z-Chromosome by Diverse Avian Species and Homology of the Z-linked Genes

  • Susumu Ohno
Part of the Monographs on Endocrinology book series (ENDOCRINOLOGY, volume 1)

Abstract

As stated in Chapter 3, the class Aves as a whole and the reptilian order Squamata appear to belong to the same genome lineage. Together they constitute one uniform group with the similar DNA value. The common characteristic shared by birds, snakes, and lizards is the possession of microchromosomes. Furthermore, it has been shown that the female heterogamety of the ZZ/ZW-type operates in snakes as well as in birds. Cytological evidence presented below suggests that the Z-chromosome of this genome lineage is very ancient in its origin. It appears that the same primitive Z has persisted in its entirety not only in diverse avian species, but also in diverse ophidian species of today.

Keywords

Japanese Quail Melanin Granule Domestic Duck Cytological Evidence Muscovy Duck 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin · Heidelberg 1966

Authors and Affiliations

  • Susumu Ohno
    • 1
  1. 1.Department of BiologyCity of Hope MedicalDuarteUSA

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