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

Question

Quizplus · Accepted Answer

The brain and spinal cord are derived from the ectoderm layer of the embryo. Since the transplanted cells developed into blue cells in the brain and spinal cord of the recipient embryo, the cells must have been transplanted into the ectoderm layer of the recipient embryo.

A Mad Scientist Decides to Start Combining Embryos and See