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Divergence - mechanism of gastrulation, Biology
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.
Posted Date: 10/4/2012 5:35:59 AM | Location : United States
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