Hans Spemann and Hilde Mangold conducted pioneering experiments in which they transplanted the dorsal lip of the blastopore in an early gastrula newt to the ventral side of another early gastrula newt. What was the outcome of this experiment?
A. Discovery of Spemann's organizer.
B. The development of dorsal structures (neural tube, notochord) on both the dorsal and ventral parts of the gastrula that received the transplant.
C. Identification of a morphogenic field in the dorsal lip of the blastopore of an early gastrula.
D. Discovery of a group of embryonic cells in the dorsal lip that ultimately produce specific body structures.
E. All of the choices are correct.
E. All of the choices are correct.
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