Question

1. Name the process that takes place during the process of embryogenesis?

Answer 1

Embryogenesis is the process of development of zygote into an embryo. It is more often involves only mitosis. It may occur outside the body of parent organism, as in oviparous animals.

• The zygote undergoes rapid mitotic divisions with no significant growth and cellular differentiation, leading to development of an embryo.
• Because of cell division, cluster of cells formed in the same size as the original zygote. This process is known as cleavage.
• After the 7th cleavage it becomes 128 cells and now the embryo is called as blastula.
• Then the germ layers started its formation. They are the ectoderm, mesoderm and endoderm. Cells migrate to the interior of the blastula, as a consequence forming two or three germ layers.
• Now the embryo is known as gastrula. The diploblastic animals have the ectoderm and the endoderm and the triploblastic animals have all the three germ layers.
• Then the organogenesis begins.
• Organs arise at this time like kidney, heart and etc. But after this the development would be different for different organisms.
• At end of embryonic development, the fully grown embryo would be formed.