The primitive streak in a bird embryo is the functional equivalent to which of the following structures?
A) the lip of the blastopore in the frog
B) the archenteron in a frog
C) the notochord in a mammal
D) neural crest cells in a mammal

Question

Quizplus · Accepted Answer

The primitive streak in a bird embryo is functionally equivalent to the lip of the blastopore in a frog, as both structures mark regions where cells begin to move inward during the early stages of gastrulation, setting up the basic body plan of the embryo.

The Primitive Streak in a Bird Embryo Is the Functional