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American Zoologist 1972 12(2):213-221; doi:10.1093/icb/12.2.213
© 1972 by The Society for Integrative and Comparative Biology
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Sex Chromatin Frequency in the Avian Aminon

DONNA GORECKI and L V DOMM
Department of Anatomy, Loyola University Stritch School of Medicine Maywood, Illinois 60153

Conflicting results have been reported on the incidence of sex chromatin in avian cells. In this study the sex chromatin frequencies are explored in the ammotic cells from two .Leghorn varieties of domestic fowl, a species which is reported to possess an heterochromatic and late leplicating W sex chromosome. The incidence of sex chromatin was also examined in the ammotic epithelium of the Japanese quail throughout the incubation period. This species of quail possesses a W sex chromosome that is euchromatic at metaphase

When the sex chromatin frequencies in the domestic fowl were compared with the gonadal sex of the embryos, a nuclear sexual dimorphism was apparent with the high frequencies corresponding to embryos of the female sex. No such nuclear sexual dimorphism was found in the quail, both male and female embryos had approximately the same incidence of sex chromatin in their ammotic cells

These findings are interpreted in support of the idea that the cytological entity identified as sex chiomatin in the domestic fowl represents the W sex chromosome in the interphase nucleus


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