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 Drug Effects on Food Intake - Anorexic Effect? Have an anorexic effect, either as a direct effect of the drug on appetite e.g., some antibiotics or because of side-effec

To "express" a gene is to make it to function properly. A gene which encodes a protein will, when expressed, be transcribed or translated to produce that particular protein. A gene

PLACENTA - A common tissue of foetus & mother (uterus) which is physical, physiological & endocrinal connection is known as placenta. FUNCTIO N - To provide nutrients

In the time of Darwin the results of Mendel's research on biological inheritance had not been published, Genetics was not yet developed, neither DNA nor the concept of genetic muta

Define Importance of Bioelectrical impedance analysis? Bioelectrical impedance analysis (BIA) is a rapid, non-invasive and relatively inexpensive method for evaluating body com

What are the three qualities specific to colour vision There are three qualities specific to colour vision- hue, saturation, and brightness. Hue: Hue is the function of a wa

Explain about the term demand. Demand: Potential customers (consumers, buyers or households) of a good or a service into a market, which normally a demand curve is utiliz

Scanning Electron Microscopy (SEM) While 'TEM is useful to study the internal structul-c of thc ccll. SEM is an important technique if you wish to examine the surl'ace features o

Structure of plasmodium

Define Vitamins requirement to avoid underweight problem? Vitamins and Minerals: If the diet provides good amounts of fresh fruits and vegetables, vitamin or mineral supplement