Gastrulation in amphibians, Biology

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.

Posted Date: 1/25/2013 5:04:18 AM | Location : United States







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

Write discussion on Gastrulation in amphibians
Your posts are moderated
Related Questions

Define nutrient requirements and principles of meal planning? In this , we started our discussion with the school age and its characteristics. We learnt about the physical grow

Toxic agents present in food which interfere with thyroxine synthesis lead to the development of: 1. toxic goitre 2. cretinism 3. simple goitre 4. thyrotoxicosis si

What is Diagnosis of Heart Disease in the Newborn ? Clinical diagnosis of heart disease in the newborn can be quite challenging. Manifestations of potentially life threatening

as newly appointed food safety manager within a medium seized

What concentrations of succrose gradient are used to separate between the two types of endoplasmic reticulum please?

Mountains and their forest ecosystems are regarded as the water towers of the world. A good example is the extraordinarily massive Himalayan Mountains which have shaped the climate

Q. As a result of the DNA replication two DNA molecules come into existence. Why is it not correct to assert that the two "new" DNA molecules are created? What is the name given to

How is L. monoctogenes infection transmitted? Listriosis caused by Listeria monocytogenes infection. Transmitted by animal excretions (faecal matter) and secretions, infecte

The volume of Mrs. X's plasma was 3 liters before Ed administered the IV. Assume that there was a complete mixing of the administered water with her plasma but no mixing with her i