Cleavage and gastrulation, Biology

Assignment Help:

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.


Related Discussions:- Cleavage and gastrulation

Explain mental changes - clinical signs of kwashiorkor, Explain Mental chan...

Explain Mental changes - clinical signs of kwashiorkor? You would find a kwashiorkor child to be unusually apathetic with absolutely no interest in the surroundings. The child

Symptoms of ulcerative colitis, Q. Symptoms of ulcerative colitis? As d...

Q. Symptoms of ulcerative colitis? As discussed in the case study above, the common symptoms are: 1. Mild abdominaI discomfort, an urgent need to defecate several times a da

Psyiology, I need help with p-p, q-q and r-r intervals and heart rates

I need help with p-p, q-q and r-r intervals and heart rates

Which part of heart serves as an actuating signal, Which of the following s...

Which of the following serves as an actuating signal, or as part of an actuating signal, in a negative feedback system? A. Action potentials in sympathetic neurons that release

Which is the other adnexal gland of the digestive system, Besides the liver...

Besides the liver which is the other adnexal gland of the digestive system that releases substances in the duodenum participating in extracellular digestion? The other adnexal

Genetic explanation for the appearance, You work with flies and you have id...

You work with flies and you have identified a single gene that can cause flies to either have two heads or one head (depending on the genotype of this gene), and that is all you kn

Agro industrial-calcium, Calcium   The calcium content in forages is affe...

Calcium   The calcium content in forages is affected by species, plant part (leaf versus stem), plant maturity, soil content of calcium and climate. Forages are usually a good so

Relevance of food packaging, Q. Relevance of food packaging? To unders...

Q. Relevance of food packaging? To understand the relevance of food packaging, it is necessary for us to understand how spoilage reduces the availability of food. In the deve

Explain about the glycoproteins, Explain about the Glycoproteins? Most...

Explain about the Glycoproteins? Most of the naturally occurring conjugated proteins are glycoproteins. Sugar molecules are covalently bound to them, especially those secreted

Briefly describe about the hypokalemia, Briefly Describe about the hypokale...

Briefly Describe about the hypokalemia? Hyperkalemia occurs when serum K levels are greater than 5 1n ML. High plasma K results in cardiac arrhythmias. A K level of 8.0 m MIL c

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd