A Mad Scientist Decides to Start Combining Embryos and See

A mad scientist decides to start combining embryos and see what develops. He takes cells from the blastula of a frog with blue skin and transplants them into the blastula of a yellow -skinned frog. The embryo receiving the cells develops blue cells in its brain and spinal cord. The scientist must have transplanted the cells into the___________ of the recipient embryo.

A) mesoderm
B) allantois
C) ectoderm
D) endoderm
E) yolk sac

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