Final answer:
The noggin protein induces the dorsal ectoderm to become the neural tube, which will develop into the brain and spinal cord.
Step-by-step explanation:
The noggin protein induces the dorsal ectoderm to become the a) Neural tube. Following gastrulation and neurulation, neuroectodermal tissues along the length of the embryo thicken into the neural plate. This plate folds upward into a neural fold, which eventually converges to form the neural tube. The neural tube will develop into the brain and spinal cord.