Question

Gastrulation is a process of

• A. Formation of archenteron
• B. Migration of prospective endomesodermal cells
• C. Differentiation of three primary germ layers
• D. All of the above

Answer 1

Answer: (D)

All of the above

The first major developmental event, that the embryonic disc will undergo is gastrulation. During this process, the cells of the embryo undergo significant movements as they rearrange themselves. These movements ultimately lead to the establishment of the basic tissue types, that will lead to the generation of the organs.

Gastrulation also results in the establishment of the general layout of the body plan. Because of the broadly reaching impact on development, this stage is critically important for the continued development of the embryo. Before gastrulation, the embryonic disc is essentially made up of two layers of cells and is referred to as being bilaminar. The cell movements are the principle events associated with gastrulation. These cell movements transform the bilaminar embryonic disc into a more complex structure made up of three distinct layers.

Collectively these populations of cells are known as the three germ layers: the ectoderm, the endoderm, and the mesoderm. The primitive gut that forms during gastrulation in the developing embryo is known as the archenteron or the digestive tube. It develops into the digestive tract of an animal.

Thus, the correct option is (D).