In a classical experiment,a portion of an amphibian gastrula was transplanted to the belly region of another embryo,resulting in the formation of a secondary embryo organized by the graft from host tissue.The equivalent area of the human embryo that would be expected to have similar organizer activity is what structure?

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The organizer activity in amphibian gastrula is due to a structure called the dorsal lip of the blastopore, which can induce the formation of a secondary embryo. The equivalent structure in humans is the node, which also plays a key role in organizing the developing embryo. The other choices (B) somites, (C) cardiac mesoderm, (D) cloacal membrane, and (E) body fold, do not have organizer activity similar to the dorsal lip of the blastopore or the node.

In a Classical Experiment,a Portion of an Amphibian Gastrula Was