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
Explain chilling temperatures - method of food Preservation? (a) Cellar storage temperatures (about 15° C): It is usually used for the storage of surplus foods like root crops,

Q. Preservation of Tooth Structure? Fixed partial dentures have been considered the standard of treatment prior to advent of implant therapy. However, to obtain optimal esthe

State two characteristics of humans which distinguish them from other primates. Two features which differentiate humans from other primates are their upright posture and their

Lorica - body form Protozoans It is a covering which unlike the theca fits loosely around the organism. It is a cup, bell or vase-like structure with one opening through which

Classification of agro-industrial byproducts Based on their nutrient content agro-industrial byproducts can be divided into: 1.  Feed low in fiber and low in protein. These ar

What are the main constituents of the earth's atmosphere in our time? The present atmosphere of the earth is constituted essentially of molecular nitrogen (N2) and molecular ox

Explain about the Prebiotics? Ingredients/compounds that have a beneficial effect on microflora in the large intestine of the host e.g. fibre, fructo oligosaccharides, lactulos

Explain about the Protein Isolates? Before we begin our discussion on protein isolates, let us first get to know how protein concentrates differ from isolates. Basically, the t

What is deplasmolysis of plant cells? The plant cell when placed under hypertonic medium loses a huge amount of water and its cell membrane detaches from the cell wall. In that

Pulmonary edema occurs when movement of liquid from the blood to the interstitial space and/or into the alveoli exceeds the return of liquid to the blood and its drainage through t