Biology · Developmental Biology

Antennapedia protein is normally expressed in the thoracic segment of the fruit fly and not in the head region. However, a dominant mutation of Antennapedia replaces the antenna with a leg-like structure. The following statements were made with reference to Antennapedia: A. In a dominant Antennapedia mutant, the Antennapedia gene is expressed in the head as well as in the thorax. B. In the Antennapedia mutants, the Antennapedia gene is expressed in the head region only and thus promotes a leg-like structure in the head socket. C. In addition to promoting thoracic structures, Antennapedia protein binds to and represses the enhancer of homothorax and some other genes responsible for antenna specification. D. Antennapedia has no role in thoracic region specification and thus recessive Antennapedia mutants show no phenotypic effect. Which one of the following options represents the correct statement(s)?