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Genetics, Vol 129, 203-210, Copyright © 1991
INVESTIGATIONS |
Gonadal Dysgenesis Reveals Sexual Dimorphism in the Embryonic Germline of Drosophila
G. Wei, B. Oliver and A. P. Mahowald
Present address: Department of Molecular Genetics and Cell Biology, University of Chicago, 920 East 58th Street, Chicago, Illinois 60637.
In hybrid dysgenesis, sterility can occur in both males and females. At 27.5{deg}, however, we found that P element-induced germline death was restricted to females. This sex-specific gonadal dysgenesis (GD) is complete by the first larval instar stage. As such, GD at 27.5{deg} reveals the sexually dimorphic character of the embryonic germline. The only other known dimorphic trait of the embryonic germline is the requirement for ovo. ovo is required for germline development in females only and has been implicated in germline sex determination. Dominant mutations of ovo partially suppressed female GD. Although embryonic germ cells are undifferentiated and morphologically indistinguishable between males and females, the functional dimorphism seen in ovo requirement and GD at 27.5{deg} indicates that sexual identity in Drosophila germ cells is established in embryogenesis.
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