Gastrulation in amphibians, Biology

Assignment Help:

Gastrulation in Amphibians

Amphibians comprise a large and moderately telolecithal egg. Cleavage is holoblastic and unequal generating a spherical blastula along with a reduced eccentric blastocoel shifted towards the animal pole. The blastocoel has a thin roof of various layers of small yolk-poor cells and a floor of large yolk-laden cells various layers deep extending down to the vegetal pole. The procedure of gastrulation starting with such a blastula is complicated since it is impossible for the enormous mass of large yolk cells in the floor of the reduced blastocoel of the cells to invaginate from the vegetal pole inwards as takes place in sea urchin. In place, invagination begins on the future dorsal side of the embryo where cells are small and less yolky. Furthermore, invagination is very limited and only initiates gastrulation; rest of the gastrulation process involves a variety of cell movements involving convergence, divergence.


Related Discussions:- Gastrulation in amphibians

Define about the iodine toxicity, Define about the Iodine Toxicity? A w...

Define about the Iodine Toxicity? A wide range of iodine intakes is tolerated by most individuals, owing to the ability of the thyroid to regulate total body iodine. This toler

Digestive system, Explain the process by which the kidney varies the volume...

Explain the process by which the kidney varies the volume and concentration of urine

On which type of basis you classify the plants, Q. On which type of Basis y...

Q. On which type of Basis you classify the plants? Linnaeus mainly employed the characters of stamens and carpels and that is why the system is called as Sexual system of class

Signaling molecules with intracellular receptors, Little  lipophilic  (lipi...

Little  lipophilic  (lipid-soluble)  hormones  distribute  across  the plasma  membrane and  then  interact  with  intracellular  receptors  in  the  nucleus/cytosol.  The receptor

Explain phenetic classification, Phenetic Classification This system is ...

Phenetic Classification This system is based exclusively upon face value of observed characters without direct reference to phylogeny. The taxa are either classified on the basi

Define root-end resection apicoectomy, Define Root-End Resection Apicoectom...

Define Root-End Resection Apicoectomy a. Examine the root surface before cutting for: cracks, anatomical variations, and quality of orthograde obturation. b. Cut the root en

How are the concepts of the dna, Q How are the concepts of the DNA, gene, a...

Q How are the concepts of the DNA, gene, and proteins characteristics of living beings related? Characteristics of organisms depend on chemical reactions that take place in the

Difference between diabetes mellitus and diabetes insipidus, Q. What is the...

Q. What is the difference between diabetes mellitus and diabetes insipidus? What are the characteristic signs of diabetes insipidus? Diabetes mellitus is the disease caused by

Making individual rock collections, Making individual rock collections ...

Making individual rock collections Peoples should be encouraged to make their own collection of rocks. Small pasteboard or cigar boxes will serve to be the collections. The spe

Define vitamin and mineral supplements for treatment for pem, Define Vitami...

Define Vitamin and mineral supplements for treatment for PEM? All cases of severe PEM require multivitamin preparation to meet the increased demands during recovery. Iron (60 m

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