Gastrulation in chick, Biology

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.

Posted Date: 1/25/2013 5:25:09 AM | Location : United States







Related Discussions:- Gastrulation in chick, Assignment Help, Ask Question on Gastrulation in chick, Get Answer, Expert's Help, Gastrulation in chick Discussions

Write discussion on Gastrulation in chick
Your posts are moderated
Related Questions
Hypoglycaemia When Driving Hypoglycemia is particularly dangerous if it happens to someone who is driving. People with hypoglycemia may have trouble concentrating or se

What do you understand by Exoskeleton. Supporting structures of skeleton not surrounded by the body. Endoskeletal elements are secreted by an underlying epidermis and one side

Suppose a sample of 200 microliters of blood needs to be diluted 1/50. How much diluents should be added and what will be the final volume? Show all steps.

What is xaxim? Most pteridophytes have subterraneous stems similar to the substrate called as rhizomes. Xaxim is a kind of pteridophyte with an aerial stem in generally perpend

Q. How can the presence, function of muscular tissue and localization in beings of the phylum Annelida is explained? In these beings there are a longitudinal muscular layer und

Coxal Glands There is a pair of coxal glands, in almost all the segments in Onychophora (Peripatus). Developmentally; in every segment a hollow follicle or somite arises and i

The nominalists deny the existence of Plato's "types". For them only individuals exist. Species are man-made artificial abstractions. But naturalists, the biologists who have actua

Describe the Planes of Muscles The planes of superior and inferior recti in primary position form an angle of about 23 0 with the Y-axis. Therefore, the axis of rotation of th

Is it more indicated for a geneticist desiring to map the X chromosome of the mother of a given family (the researcher does not have access to her DNA, only access to the genetic m

what is the effect of insuline in body ?