Cells Move to New Positions as an Embryo Establishes Its

Question

Cells move to new positions as an embryo establishes its three germ tissue layers during
A) determination.
B) cleavage.
C) fertilization.
D) induction.
E) gastrulation.

Accepted Answer

The process of cell movement to establish three germ tissue layers occurs during gastrulation, which is when the embryo undergoes extensive morphological changes to form the three germ layers: endoderm, mesoderm, and ectoderm. Determination, cleavage, fertilization, and induction are all processes that occur earlier in embryonic development, and do not involve the extensive cell migration that occurs during gastrulation.