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

Vein grafts-longevity of conduits long term conduits, Vein Grafts :  ...

Vein Grafts :  At the end of ten years only 50 per cent of saphenous vein grafts are paten1 and 50 per cent of the rest may have significant atherosclerotic changes. In a

How do the golgi apparatus act, Q. How do the Golgi apparatus act and the r...

Q. How do the Golgi apparatus act and the rough endoplasmic reticulum in the production and releasing of proteins? The rough endoplasmic reticulum has in its outer membrane man

Explain nucleoside reverse transcriptase inhibitors, Normal 0 f...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Power plants of the aerobic cells, Why can mitochondria be considered the p...

Why can mitochondria be considered the power plants of the aerobic cells? Ans) Mitochondria are the "power plants" of aerobic cells due to within them the final stages of the ce

Explain causes of shigellosis, Q. Explain causes of Shigellosis? Shigel...

Q. Explain causes of Shigellosis? Shigellosis is caused by the genus Shigella and is a common enteric (intestinal) infection. The genus has four serological groups,

Determine the different types of sensory receptors, Determine the different...

Determine the different types of sensory receptors There are different types of sensory receptors as follows:  Visual receptors in the eyes for vision.  Auditory receptor

What is polygenic inheritance?, What is polygenic inheritance? How does it ...

What is polygenic inheritance? How does it work?  The Polygenic inheritance, also called as quantitative inheritance, is the gene interaction in which a given trait is conditio

Explain the consequences of malnutrition, Explain the Consequences of Malnu...

Explain the Consequences of Malnutrition? Malnutrition manifests itself in terms of illness and death in all age groups. Children, pregnant women, nursing mothers and elderly a

Fossilisation, FOSSILIS A TIO N - The organisms are preserved and...

FOSSILIS A TIO N - The organisms are preserved and fossilized when they are buried in the ice, in an oil rich soil, in the lava of volcano, in swamps, in desiccated deser

After purchasing - nursing software, After Purchasing The following po...

After Purchasing The following points should be considered for after purchase facilities. Avail of any training the software engineer or vendor may provide, even if it

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