The primitive streak in a bird is the functional equivalent of ________.
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 is the functional equivalent of the lip of the blastopore in the frog as both structures are important for determining the embryonic axis and establishing the basic body plan of the developing organism. The archenteron in a frog is a cavity that forms during gastrulation and will eventually become the gut or digestive tract. The notochord in a mammal is a rod-like structure that runs down the length of the developing embryo and is important for inducing the formation of the neural tube. Neural crest cells in a mammal are a group of cells that migrate away from the neural tube and differentiate into various cell types such as neurons, glial cells, and pigment cells.

The Primitive Streak in a Bird Is the Functional Equivalent