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

Plants of the open water zone, Plants of the open water zone In this z...

Plants of the open water zone In this zone plants are restricted to the limnetic one and generally consist of phytoplankton such as dinoflagellates, blue green algae and green

Viral diseases - avian encephalomyelitis, V i ra l Diseases A v ...

V i ra l Diseases A v ian encephalomyelitis This is enterovirus disease of chicken, pheasants, turkeys and Japanese quails caused by the member of the family Pi

How can the abundance and diversity of living beings, How can the abundance...

How can the abundance and diversity of living beings in the tropical forests be explained? The biodiversity of these ecosystems can be defined by the great availability of the

What is colony collapse disorder, Q. What is Colony Collapse Disorder? ...

Q. What is Colony Collapse Disorder? Bee colonies are attacked by a variety of pathogens and parasites. One major pathogen is the acute bee paralysis virus (IAPV), which cau

Similarities between pisces and amphibians, Ask question #Minimuwhat are th...

Ask question #Minimuwhat are the similarities between pisces and amphibians

What is sodium-potassium pump atpase, What is sodium-potassium pump ATPase?...

What is sodium-potassium pump ATPase?   A.  There is a net flux of sodium from intracellular spaces into luminal spaces through sodium-potassium pump ATPase spanning proteins l

Agro industrial-selenium, Selenium Glutathione peroxidase (GSH-Px) was...

Selenium Glutathione peroxidase (GSH-Px) was the first selenium metalloenzyme identified.Glutathione peroxidase catalyzes the reduction of hydrogen peroxide and lipid h yp r o

What is the life cycle of the hookworms, Q. What is the life cycle of the h...

Q. What is the life cycle of the hookworms? The Adult hookworms within the human intestine release eggs that are eliminated with the human feces. Under the adequate conditions

Zooflagellates – protozoan, Zooflagellates – Protozoan Zooflagellates ...

Zooflagellates – Protozoan Zooflagellates are heterotrophs that are free living, commensals or symbiotic or parasitic in other animals. A number of species eg. Trichonynzpha a

How dissimilar are walls of these two types of blood vessel, Are the arteri...

Are the arteries or the veins constituted of more muscle tissue? How dissimilar are the walls of these two types of blood vessels? The arterial system has thicker muscle walls

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