Suppose the protein specified by bicoid was injected into drosophila embryos, so that a high concentration was present everywhere in the embryo. what might be the result of such an experiment

I believe that answer would be that the embryos would show no development of posterior regions. Bicoid protein is a transcription factor and also a morphogen. It has a DNA binding homeodomain that binds both DNA and the nanos mRNA. It binds a specific RNA sequence in the 3' untranslated region, called the Bicoid 3'-UTR regulatory element, of caudal mRNA and blocks translation.