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
What is Tagma, Tagmosis and Tagmatization? Distinct body regions resulting when different segments of a metameric animal become involved in specific functions. These segments a

Q. Zonation in the ocean? The oceans play a major role in determining the climate and sustaining life on earth. Oceans help to redistribute the solar energy, through ocean curr

Energy demand for Active or moderately active lifestyles? These people have occupations that are not strenuous in terms of energy demands, but involve more energy expenditure t

whats the meaning of asexual reproduction

Explain about the Dietary Calcium Requirements? There are variations in the amount of calcium recommended by different advisory groups. This is mainly due to the different crit

Poultry Mycoplasma gallisepticum causes chronic respiratory disease (CRD) in chickens. The incubation period is 1-3 weeks. In young birds, the disease is less severe than adult


Elaborate Extracorporial in detail. Outside of the body. An example is extracorporial digestion found in some animals where digestive enzymes are regurgitated into food. Once i

Q. What is the kind of digestion that occurs in cnidarians? These animals have a digestive cavity and they make intracellular and extracellular digestion. The extracellular dig

I need help with my biology virtual lab. Its due tomorrow