Refer to the figure showing some of the manipulations carried out by Spemann on developing amphibians. Experiment 2 resulted in
A) two clumps of undifferentiated cells.
B) two normal embryos.
C) one normal embryo from the side containing gray crescent and one clump of undifferentiated cells from the side lacking gray crescent.
D) two embryos joined at the belly.
E) one normal embryo from the side lacking gray crescent and one clump of undifferentiated cells from the side containing gray crescent.

Question

Refer to the figure showing some of the manipulations carried out by Spemann on developing amphibians.  Experiment 2 resulted in
A) two clumps of undifferentiated cells. 
B) two normal embryos. 
C) one normal embryo from the side containing gray crescent and one clump of undifferentiated cells from the side lacking gray crescent. 
D) two embryos joined at the belly. 
E) one normal embryo from the side lacking gray crescent and one clump of undifferentiated cells from the side containing gray crescent.

Quizplus · Accepted Answer

Experiment 2 involved transplanting the gray crescent from one embryo to the opposite side of another embryo. The side with the gray crescent typically develops into the dorsal side while the opposite side develops into the ventral side. Therefore, in Experiment 2, one side of the embryo lacked a gray crescent while the other side had two gray crescents. This resulted in one normal embryo developing from the side with the gray crescent and one clump of undifferentiated cells from the side lacking gray crescent.

Refer to the Figure Showing Some of the Manipulations Carried