Which of the following is true about Spemann's experiments with 2-cell-stage embryos?
A - The experiments resulted in embryos with two sets of body axes and structures.
B - The experiments resulted in embryos with two sets of body axes and structures.
C - All of the cells could only form the ventral side of the embryo.
D - Some of the cells formed complete, half-sized embryos, but some of them only formed the ventral side of the embryo.
E - All of the cells formed complete, half-sized embryos.
Answer: D - Some of the cells formed complete, half-sized embryos, but some of them only formed the ventral side of the embryo.
In some cases, both of the separated cells produced fully-formed, half-sized embryos, but in others, one cell would form a complete half-sized embryo, and the other would form only the ventral half of the embryo.