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

Explain what is light microscope - microscopy, Explain what is Light Micros...

Explain what is Light Microscope - Microscopy Modern light microscopes are compound microscopes. Here the magnified image formed by the objective lens is further enlarged by on

Cockroach heart, How last chamber of heart in cockroach receives blood with...

How last chamber of heart in cockroach receives blood without having ostia?

Contraceptive pill - reproduction, Contraceptive Pill - Reproduction ...

Contraceptive Pill - Reproduction About sixty million women in the world are currently using oral steroid contraceptives. These contraceptives usually consist of a synthetic

Advantages of implant supported maxillo-facial prosthesis, Q. Discuss the a...

Q. Discuss the advantages of implant supported maxillo-facial prosthesis. Maxillofacial Prosthodontics involves the prosthetic rehabilitation of patients with congenital or acq

Vasa diffrentia, VAS A DIFFRENTIA - Originate from wollfian duct ....

VAS A DIFFRENTIA - Originate from wollfian duct . It comes out fo cauda epdidymis enters into abdominal cavity through inguinal canal, forms loop round the uretor and j

Red flowers is crossed with a white-flowered plant, A plant with red flower...

A plant with red flowers is crossed with a white-flowered plant of the similar species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower colour

Respiration in cockroach, what is the chemical reaction of respiration in c...

what is the chemical reaction of respiration in cockroach?

Poverty and malnutrition, Poverty and Malnutrition Poverty and malnutr...

Poverty and Malnutrition Poverty and malnutrition are closely related. As noted before, many elementary aspects of being poor like hunger, inadequate health care, unhygienic l

What is uric acid , Uric acid is the main nitrogenous waste product o...

Uric acid is the main nitrogenous waste product of uricotelic organisms (birds, insects and reptiles), but is also established in ureotelic organisms from the breakdown of the puri

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