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

Mouse bioassay and mongoose bioassay, Question: (i) Which species of m...

Question: (i) Which species of microalgae are associated with ciguatera fish poisoning? (ii) Name five fish species generally implicated in ciguatera fish poisoning in Mau

How to antioxidants work in cancer prevention, How to antioxidants work in ...

How to antioxidants work in Cancer Prevention? As cells function normally in the body, they produce damaged molecules called free radicals. These force radicals, we learnt are

Explain about the salting - methods of food processing, Explain about the S...

Explain about the Salting - Methods of Food Processing? Salting: Salting, especially of meat, is an ancient preservation technique. Food is treated with salt or a strong salt s

What are imago and nymph, Q. What are imago and nymph? Nymphs are larva...

Q. What are imago and nymph? Nymphs are larvae of hemimetabolic insects (like grasshoppers). They are very similar to the adult insect although smaller, In holometabolic insect

What is the large size of cephalopods, Q How is the large size of some ceph...

Q How is the large size of some cephalopods related to the kind of circulatory system they present? In cephalopods the circulatory system is closed and this provides more press

Conduction system - heart, In this unit, you have learnt that heart is a mu...

In this unit, you have learnt that heart is a muscular organ situated in thorax covering with pericardium and consist of four chambers i.e. right atrium, left atrium, right ventric

Describe systolic sounds in heart dieases, Describe Systolic Sounds in hear...

Describe Systolic Sounds in heart dieases? Early Systolic Sounds: Aortic or pulmonary ejection sounds are the most common early systolic sounds. These are high frequency soun

Respiratory distress syndrome, Respiratory Distress Syndrome: Respirat...

Respiratory Distress Syndrome: Respiratory distress in a  newborn is  a challenging problem.  It  accounts for significant morbidity and mortality. It occurs  in  4 to 6 per c

Objective of the radiographic technique, Objective of the Radiographic Tech...

Objective of the Radiographic Technique The ball bearings are opaque and their diameter have to be measured with the help of vernier caliper prior to use. (2 to 5 mm diameter b

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