Answer this question in detailed manner.

Dear student,
Please find below the answer:

Gastrulation is a first morphogenic movement that occurs in the embryo resulting in the reorganization of cells in the embryo to form three germ layers i.e ectoderm, mesoderm, and endoderm. These movements include invagination, ingression, and involution.

Gastrulation by invagination means that the movement of cells in the embryo also occurs by invagination. Invagination is one of the types of movements occurring during gastrulation during which an epithelial sheet of cells bends inward. 
Gastrulation by Involution implies the inward rotation of cells as seen in the gastrulation of amphibian and avian eggs. 
Gastrulation by Ingression involves the movement of cells inwards. 

Hope this clears your doubt.

  • 0
What are you looking for?