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

What is consanguineal marriage, What is consanguineal marriage? Why is the ...

What is consanguineal marriage? Why is the appearing of genetic disease more probable in the offspring of a consanguineal marriage? The Consanguineal marriage is the marriage b

Predict whether narrowing or widening of the blood vessels, Body temperatur...

Body temperature is homeostatic ally regulated around a set point. Given your knowledge of negative feedback and homeostatic control system, predict whether narrowing or widening o

What is predatism, Q. What is predatism? The Predatism is the ecologica...

Q. What is predatism? The Predatism is the ecological interaction in which one individual kills or mutilates another to get food. The Predatism is an inharmonious (negative) ec

Determine the assess mobility of prosthesis, Assess Mobility of Prosthesis ...

Assess Mobility of Prosthesis All implant-supported prostheses must be stable.  To detect mobility, place an explorer or scaler under the embrasures and apply gentle pressure i

Biotechnology... what is the answer/, At a biotechnologist, employment oppo...

At a biotechnologist, employment opportunities can be found in many areas. In addition to biotechnology companies, where can a scientist with a biotechnology background find employ

What is blood typing?, What is blood typing? The Blood typing is the de...

What is blood typing? The Blood typing is the determination, by means of tests, of the classification of a blood sample concerning blood group systems (specially the Rh system

Explain apoptosis, Changes those are associated with programmed cell death,...

Changes those are associated with programmed cell death, containing release of apoptotic bodies, blebbing, and nuclear fragmentation.

Why deficiency of folate take place, Why Deficiency of Folate take place? ...

Why Deficiency of Folate take place? If there is inadequate dietary folate, the activity of both the DNA and the methylation cycles, described above, will be reduced. A decrea

Morphogenetic movements, Morphogenetic Movements Gastrulation is a dy...

Morphogenetic Movements Gastrulation is a dynamic process including a variety of coordinated movements of cells of dissimilar areas of the blastula. The movements of cells in

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