Meroblastic or partial cleavage, Biology

Assignment Help:

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.


Related Discussions:- Meroblastic or partial cleavage

Show the process of cell-to-cell communication, On the overall process of c...

On the overall process of cell-to-cell communication within the nervous system, what role does the Ca2+ play in the synapse? A) contributes in the biosynthesis of acetylcholine B)

Write in 3-4 lines about foot examination, Write in 3-4 lines about foot ex...

Write in 3-4 lines about foot examination Foot ulceration and amputation are common and major causes of morbidity and disability in people with diabetes. Skin integrity should

Explain metabolic requierments for types of exercise, Explain Metabolic Req...

Explain Metabolic Requierments For Types Of Exercise ? A relative scale of energy requirements related to heart function necessary for performing various daily activities has b

Complications of phototherapy, Complications of Phototherapy i) Inse...

Complications of Phototherapy i) Insensible water loss: There is increased insensible water loss in infants undergoing phototherapy. ii) Gastrointestinal effects: Photot

Is there such thing as good evaporation and bad evaporation, Hello I have b...

Hello I have been working with reptiles for a while and have been researching the incubation method known as egg suspended. This method is used with birds. Its placeing an egg on a

What are x-linked traits, What are X-linked traits? The X-linked traits...

What are X-linked traits? The X-linked traits are the phenotypical traits conditioned by genes located in the nonhomologous (heterologous) portions of the X chromosome.

Is the ventricle lumen larger during diastole, Q. Is the ventricle lumen la...

Q. Is the ventricle lumen larger during diastole or during systole? During diastole the opposite occurs. The muscle fibers of the ventricles relax and the lumen of these chambe

Companion cells, Companion cells  are the specialized cells in the phloem w...

Companion cells  are the specialized cells in the phloem which load sugars into the sieve elements and help to maintain a functional plasma membrane in the sieve elements.

Explain prophylaxis - diarrhea, Prophylaxis Medical Letter consultants...

Prophylaxis Medical Letter consultants generally do not prescribe antibiotic prophylaxis for travelers' diarrhea, but rather instruct thec patient to begin self-treatment when

Find final atp count in both prokaryotes and eukaryotes, Degrade a monoglyc...

Degrade a monoglyceride that has an 18-carbon fatty acid attached to it by Ester bonds. You will have to degrade the glycerol component followed by the fatty acid in presence of O2

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