Conservation of the Original Z-Chromosome by Diverse Avian Species and Homology of the Z-linked Genes
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.
KeywordsJapanese Quail Melanin Granule Domestic Duck Cytological Evidence Muscovy Duck
Unable to display preview. Download preview PDF.
- Bateson, W.: Mendel’s principles of heredity. Cambridge ( England ): University Press 1913.Google Scholar
- Duncker, H.: Genetik der Kanarienvögel. Bibliographia genetica 9, 37–140 (1928).Google Scholar
- Hutt, F. B., and C. D. Mueller: Sex-linked albinism in the turkey, Meleagris gallopavo. J. Hered. 33, 69–77 (1942).Google Scholar
- Hutt, F. B., and C. D. Mueller: Genetics of the fowl. New York: McGraw-Hill 1949.Google Scholar
- Levi, W. M.: The pigeon. Sex-linkage in pp. 243–249. Columbia, S. C.: The R. L. Bryan Comp. 1951.Google Scholar
- Lyon, M. F.: A further mutation of the mottled type in the house mouse. J. Hered. 51, 116–121 (1960).Google Scholar
- Steiner, H.: Vererbungsstudien am Wellensittich Melopsittacus undulatus. Arch. Klaus-Stift. Vererb.-L. 7, 37–202 (1932).Google Scholar
- Yamashina, Y.: Studies on the chromosomes in twenty-five species of birds. Genetics 2, 27–38 (1951).Google Scholar