Biology · Developmental Biology

The Dorsal protein is involved in generating dorsal-ventral (DV) polarity in Drosophila. The following statements were made regarding the activity of the Dorsal protein in establishing DV polarity: A. In embryos that lack Gurken protein, the Dorsal protein is not translocated to the nucleus of the follicle cells, which then causes ventralization of the embryo. B. Though Dorsal protein acts as a morphogen, it is found throughout the syncytial blastoderm of the early Drosophila embryo. C. In embryos that lack Cactus protein, the Dorsal protein can be found in the nucleus of cells with a ventral fate. D. If the Dorsal protein is blocked from entering the nucleus, the genes responsible for specifying dorsal cell types are not transcribed. Which of the above statements are correct?