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

Question

Quizplus · Accepted Answer

The ectoderm is the outer layer of cells in the blastula and gives rise to the nervous system, including the brain and spinal cord. Therefore, if the blue cells from the blue-skinned frog were transplanted into the blastula of the yellow-skinned frog and developed into blue cells in the brain and spinal cord, it must have been due to the transplanted cells being ectodermal in origin.

A Mad Scientist Decides to Start Combining Embryos and See