Question

Mass separation cells in the embryo is

A) Emboly

B) Involution

C) Delamination

D) Epiboly

Answer 1

Hint: Gastrulation is the process in embryonic development that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells. Gastrulation usually involves the blastula folding in upon itself or divides, which creates two layers of cells.

Complete Answer:

- In developmental biology gastrulation is a stage before time in the embryonic development of most animals during which the blastula, which is a single-layered hollow sphere of cells, is reorganized into a multilayered structure known as the gastrula. Before gastrulation, the embryo is a continuous epithelial sheet of cells. Then by the end of gastrulation, the embryo has begun to differentiate into distinct cell lineages which set up the basic axes of the body and internalized one or more cell types with the gut.

- Emboly is also known as internalization which is the first process in gastrulation. During this process, cells of the blastula will become the endoderm, and the mesoderm is moved beneath the layer of cells which will become the ectoderm.

- During the process of involution, a tissue sheet rolls the interior to form an underlying layer through the bulk movement of tissue.

- Epiboly is the process that describes one of the five major types of cell movements that occur in the Gastrulation stage of embryonic development of some organisms. Epibolic movement is the method in which a layer of epithelial cells spreads. This can be achieved in multiple ways.

- The delamination is a process in which the separation into layers occurs, or it is the initial splitting of the cells in an embryo. It refers to the mass separation of a layer of cells from another layer by splitting. The separation of endodermal, mesodermal and notochordal cells from each other.  

The correct answer to the problem is option C, ‘delamination’.

Note: Gastrulation is a phase early of the embryonic development of most animals during which a single-layered blastula is reorganized into a three-layered structure known as the gastrula. These three distinct germ layers are known as the ectoderm, mesoderm and endoderm.