Changes in cell position occur extensively during ________.
A) organogenesis, but not during gastrulation or cleavage
B) cleavage, but not during gastrulation or organogenesis
C) fertilization and cleavage, but not during gastrulation
D) gastrulation and cleavage
E) gastrulation

Question

Quizplus · Accepted Answer

Changes in cell position occur extensively during gastrulation, which is the process that forms the three germ layers (ectoderm, mesoderm, and endoderm) from a single layer of cells. During gastrulation, cells migrate and rearrange themselves to form these different layers, which is crucial for proper development of the embryo. There are also some changes in cell position during cleavage, but these are not as extensive as during gastrulation. Changes in cell position do not occur as much during fertilization as during gastrulation and cleavage. Organogenesis, which is the formation of organs from the germ layers, involves some cell movement, but it is not as extensive or coordinated as during gastrulation.

Changes in Cell Position Occur Extensively During ________