Question

Describe the formation of three germ layers. BREIFLY !​

Answer 1

Answer:

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Explanation:

Transformation of blastula or blastocyst into gastrula is called gastrulation. During gastrulation the cells of the inner cell mass of blastocyst or blastula move in small mass to their new final location.Such movement of cells is called morphogenetic movements Gastrulation results in the formation of three germ layers: ectoderm, mesoderm and endoderm.

Formation of Endoderm :The blastocyst grows in size by obtaining nutrition from the uterus. Some cells separate from the inner cell mass (embryonic knob) to form endoderm in blastocoel.

Formation of Mesoderm: Mesoderm is formed from the caudal margin of the embryonic disc. Prior to this the existing cells undergo rapid division and a mass of cells detach from the embryonic disc to form mesoderm.

Formation of Ectoderm :After the separation of mesoderm, the remaining cells of the embryonic disc form the ectoderm layer. In this manner the three germ layers such as ectoderm, mesoderm and endoderm are formed.

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Answer 2

Answer:

Such movement of cells is called morphogenetic movements Gastrulation results in the formation of three germ layers: ectoderm, mesoderm and endoderm.

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