Cleavage and gastrulation, Biology

Cleavage and Gastrulation

Eventually, one spermatozoon fuses with the ovum to r restore the diploid genomic condition and activates all the potentials in the fertilized egg cell or zygote to develop into a new individual of the next generation. But the zygote is one cell and the adult body in the Metazoa is constituted of many cells - from a few hundred to many billions of cells. It implies that the unicellular zygote must enter the phase of rapid divisions in quick succession to convert itself into a multicellular body.

Such a series of divisions of the zygote is known as cleavage or segmentation. In this multicellular structure formed as a result of cleavage the various cells or cell groups later become rearranged as layers and sub layers during a process called gastrulation. Cleavage and gastrulation are significant phases in the ontogenetic development because cleavage transforms the unicellular zygote into a multicellular body and gastrulation lays the foundation of primary organ rudiments so as to initiate the formation of organs according to the body plan of the particular metazoan group of animals to which the particular individual belongs.

Posted Date: 1/25/2013 12:23:22 AM | Location : United States







Related Discussions:- Cleavage and gastrulation, Assignment Help, Ask Question on Cleavage and gastrulation, Get Answer, Expert's Help, Cleavage and gastrulation Discussions

Write discussion on Cleavage and gastrulation
Your posts are moderated
Related Questions
Consumers - Biotic Components These are also called as phagotrophs or heterotrophs. The organisms grouped under this category cannot manufacture their own food but obtain the

Define Equilibrium between two solid phases and a gas phase? Consider the following reaction equilibrium: 3 CuO(s) + 2NH 3 (g) ↔ 3 Cu(s) + 3H 2 O (g) + N 2 (g) Accordin

Low Ca ++ in the body fluid may be the cause of: 1.  Tetany 2. Anaemia 3. Angina pectoris 4. Gout  Tetany cause low ca ++

Determine the Adequacy of children's food? Adequacy of children's food and nutrient intake depends on: Sibling company Peer pressure Model set by parents and

Explain Some Functions of Riboflavin? Protective role: Riboflavin protects the octodermal tissues and prevents lesions  of the skin, eye and nervous system. Riboflavin amelior

site of fertilistion in human

Explain the role of Bones in human biology? Bone is covered by a tough outer membrane called the periosteum. The periosteum contains systems of capillaries that supply the bone

Q. How is the light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is converting into chemical energy contained in o

Feeding on Small Particles Microscopic algae and bacteria can be taken in directly into the cell by the digestive vacuoles. But one of the most successful methods of feeding o

Explain the introduction of history of mart disease? Cardio-vascular diseases (CVD) are the leading causes of death and disability both in the developed and the developing na