Gastrulation in reptiles and birds includes a thickening called Hensen's node, which is similar to the dorsal lip of an amphibian blastopore. Based on this, you would expect to see _______ in this region.
A) neural tube cells
B) signaling molecules that organize the developing embryo
C) modified mesodermal tissue
D) a well-developed archenteron
E) None of the above

Question

Quizplus · Accepted Answer

Hensen's node plays a critical role in organizing the developing embryo by secreting signaling molecules that establish the dorsal-ventral axis and pattern the neural tube and somites in reptiles and birds. Therefore, the presence of signaling molecules in this region would be expected.

Gastrulation in Reptiles and Birds Includes a Thickening Called Hensen's