Question

List out the morphogenetic movements using in amphibian and fish gastrulation and describe what cells undergo those movements.

Answer 1

Vegetal rotation and invagination of the bottle cells is seen in amphibians.

Bottle cells invaginate into the blastocoel and thus blastocoel displaced.it becomes divided into two regions.

The bottle cells of the margin move inward and makes lip and mesoderm involute under the roof of blastocoel.

In fishes,

Epiboly is seen in the gastrulation of fishes,

Blastoderm cells do epiboly over the yolk.

Involution of epibolizing blastoderm or delamination and ingression of cells from the epiblast makes the hypoblast cells in fishes.