Abstract
This chapter discusses the determinant nature of Drosophila development that results from molecular asymmetries present in the egg before fertilization. There are only a few such positional markers in the egg, specifying the anterior and posterior poles and the dorsal-ventral axis. During early embryogenesis, a complex cascade of genetic regulatory interactions refines this coarse positional information into the detailed pattern of the embryo. The molecular asymmetry that marks the anterior end of the Drosophila eggs is the bicoid messenger RNA. Bicoid message is produced only during oogenesis and is stably localized at one end of the oocyte, egg, and early embryo. The signal for localization, within bicoid message, appears to be the secondary structure of the 3' untranslated end.
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