Divergence - mechanism of gastrulation, Biology

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DIVERGENCE -

In it blastomeres move in different directions i.e. inside the blastocoel the blastomeres move in different directions.
The blastomeres which move inside i.e. the involuted blastomere are called chordamesoderm.
Chorda-mesoderm forms complete Notochord. Mesoderm is a part of endoderm.
Remaining endoderm forms from megameres.
At the end of gatrulation, blastopore contracts and the megameres close this pore.
These megameres look like a plug and so this is termed as Yolk plug stage. It is formed at the end of gastrulation.

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