Gastrulation in chick, Biology

Assignment Help:

Gastrulation in Chick

Cleavage in the fertilized egg occurs during its passage through the oviduct to cloaca of the hen. By the time it is laid meroblastic cleavage has resulting in the creation of a various layered W-like blastoderm in which two distinct regions can be accepted:

  1. The clear central circular area pellucida separated from the fundamental yolk through a space called the sub-germinal space or cavity and
  2. The peripheral area opaca wherein the cells of the lower layer are in intimate contact along with the yolk making this region dark and opaque.

The inner border of area opaca directly adjoining the area pellucida is the marginal zone and its remaining peripheral part is termed as the germ wall. A thickened region of marginal zone because of great density of cells indicates the future posterior side of the embryo. In chick, gastrulation is a prolonged process. It is started soon after the beginning of incubation after laying of the egg and is completed in about 4 days. The actual process of gastrulation is preceded through some pre-gastrula movements of certain cells resultant in their separation from the blastoderm and formation of a lower layer called the hypoblast. Though, Most of the cells remain in the upper layers of the blastoderm which now constitute the epiblast.


Related Discussions:- Gastrulation in chick

Inclusion body hepatitis (ibh), I nclusion body hepatitis (IBH) A dise...

I nclusion body hepatitis (IBH) A disease of chickens characterized by acute mortality, often with severe anemia, is caused by an adenovirus. A number of different serotypes h

Explain the transmission electron microscope, Explain the Transmission Elec...

Explain the Transmission Electron Microscope Here, thin and dehydrated specimen is used. Electrons pass through the specimen and form image on to photographic film. These are u

What is the phellogen? what its function, What is the phellogen? What its f...

What is the phellogen? What its function? The Phellogen also called as cork cambium is the meristematic plant tissue responsible for the formation of the periderm (the covering

Explain about enzymes, Explain about enzymes All enzymes are proteins. ...

Explain about enzymes All enzymes are proteins. Many enzyme  proteins lack catalytic activity in the absence of a non-protein component, called a 'co-factor'. In this case, the

Infective endocarditis, Infective Endocarditis   It  is a term used to ...

Infective Endocarditis   It  is a term used to include subacute bacterial endocarditis as well as infection caused by viruses  and fungi.  The causative organisms responsibl

Characteristics of the five-kingdom classification, Characteristics of the ...

Characteristics of the Five-Kingdom classification At present, as you know, the trend is to follow the five-kingdom classification. However, while accepting the Five-Kingdom C

Neo darwinism or synthetic theory of evolution, NEO DARWINISM OR SYNTHETIC ...

NEO DARWINISM OR SYNTHETIC THEORY OF EVOLUTION - It is the synthesis of the ideas of Neo Darwinians as a new theory of evolution based upon recent findings of genetics and m

What are the steroids, Q. What are the steroids? What are the few examples ...

Q. What are the steroids? What are the few examples of steroids with a biological function? Steroids are lipids based in an angular combination of four carbon rings, one ring m

Explain the reduction in free radical generation - vitamin e, Explain the R...

Explain the Reduction in free radical generation - Vitamin E? 1) Reduction in free radical generation: Vitamin E acts synergistically with selenium thereby reducing susceptibil

Class of coclentrata, ????? # 100 ??????????? #Minimum ?????? ?????

????? # 100 ??????????? #Minimum ?????? ?????

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