Question

Fill in chart:

apical constriction where it happens and when

and Epithelial to mesenchymal transition- WHAT CELL TYPE is it during this process

	Apical constriction	Epithelial to mesenchymal transition
Drosophila
Sea Urchins

Answer 1

1) Drosophila

Apical constriction is occurred during embryogenesis, ten placodes invaginate into drosophila embryo. Onset of these invaginations are marked by apical constriction of 6 cells in each placode.

The epithelial to mesenchymal transition occurs in drosophila is that the transition of mesodermal cells from an epithelial to a migratory mesenchymal state during drosophila embryogenesis.

2) Sea urchins

Apical constriction is occurred during gastrulation of sea urchin embryos. The surface of vegetal plate bends inward indicates primary invagination ie the apical constriction occurred in sea urchin.

EMT occurs in sea urchin is that the transition of blastula epithelium to skeletogenic mesenchyme at the vegetal pole of sea urchin embryo.

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