The structure in birds and mammals that is most analogous to the dorsal lip of the frog blastopore is
A) the primitive streak.
B) the archenteron.
C) the yolk plug.
D) Hensen's node.
E) the notochord.

Question

Quizplus · Accepted Answer

Hensen's node is the structure in birds and mammals that is most analogous to the dorsal lip of the frog blastopore. Both structures are involved in organizing the embryonic development and specifying the body axis. The primitive streak is a structure in birds and mammals that appears later in development and is involved in gastrulation, while the archenteron and yolk plug are specific to amphibians. The notochord is similar in function to the organ in birds and mammals, but it is not analogous to the dorsal lip of the frog blastopore.

The Structure in Birds and Mammals That Is Most Analogous