A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the night side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed.
Use the passage to answer the question.
The quail somites transplanted in a conventional order were able to develop normally in the chick embryo. Which statement BEST explains this observation?
The development of quail somites do not require signaling molecules
The development of chick somites do not require signaling molecules.
Quall somites respond to chick signaling molecules.
Chick somites respond to quail signaling molecules.
A)
(1 point)
20
2
R
R
Chick
Quail