Meroblastic or partial cleavage, Biology

Meroblastic or partial cleavage

The egg does not divide totally because divisions are restricted to only a part of the egg where as the rest of the egg remains completely uncleaved. It is of two types:

A. Discoidal meroblastic cleavage: It occurs in the heavily yoked macrolecithal and highly telolecithal eggs, as for instance in cephalopod molluscs, reptiles, birds and monotremes (egg laying mammals). The cleavage is restricted to the cytoplasmic germinal disc located at the animal pole. Even the germinal disc divides incompletely where as the entire yolk mass remains undivided.

B. Superficial meroblastic cleavage: This takes place in the centrolecithal eggs of insects. Cell divisions are restricted to the peripheral cytoplasmic layer whereas the centrally located yolky is left undivided.

Posted Date: 1/25/2013 1:28:27 AM | Location : United States







Related Discussions:- Meroblastic or partial cleavage, Assignment Help, Ask Question on Meroblastic or partial cleavage, Get Answer, Expert's Help, Meroblastic or partial cleavage Discussions

Write discussion on Meroblastic or partial cleavage
Your posts are moderated
Related Questions

Can mitosis occur in haploid (n) cells? And in triploid cells? The mitotic cell division can happen in haploid (n) cells, diploid (2n) cells, triploid (3n) cells, etc. Mitosis

Phosphorylation  of  fructose-6-phosphate Phosphorylation  of  fructose-6-phosphate: This  is  an irreversible reaction, catalyzed byphosphofructo72Snase,  (PFK-  I) a rate-l

Q What are the typical features of mammals? The typical features of mammals are: body (less or more) covered with hair; presence of the diaphragm muscle that separates the thor

Inversion We know that atmosphere is heated from below and warm air rises, but air can be prevented from rising by a condition known as inversion. An inversion refers to a situ


Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Q. How many ATP molecules are made after glycolysis? Glycolysis is a process similar to glucose degradation in fermentation it produces final balances two molecules of ATP for

A virus capsid containing vimentin, your protein of interest, gets into the cell nucleus and is broken down with the DNA being released. It is unknown whether the capsids themselve

What is a pH meter? A pH meter is a device used for measuring. pH of any unknown solution. It is composed of: a) A reference electrode b) Glass electrode whose potential