A Researcher Treats an Early Neural-Tube-Stage Embryo with a 1-Hour

Multiple Choice

A researcher treats an early neural-tube-stage embryo with a 1-hour pulse of colchicine,which arrests proliferating cells in metaphase.Where will the arrested cells be found?

A) Throughout the marginal layer of the neural tube
B) Throughout the mantle layer of the neural tube
C) Throughout the ventricular layer of the neural tube
D) Only in the floor plate of the neural tube
E) Only in the roof plate of the neural tube