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

Central cell - synergids, Central Cell - Synergids It is the largest c...

Central Cell - Synergids It is the largest cell of the embryo sac, and the mother cell of the endosperm. The enlargement of the embryo sac after the last nuclear division is m

Explain about diabetes mellitus, Explain about Diabetes mellitus Diabe...

Explain about Diabetes mellitus Diabetes mellitus (DM) has relation with all the systems of our body. With some systems it has direct relationship, while with others it has in

Transplantation - clonal propagation, Transplantation - Clonal Propagation ...

Transplantation - Clonal Propagation The shoots or plantlets multiplied on a medium containing organic nutrients, show poor photosynthetic capability. Moreover, in these pla

What are neurodegenerative diseases, What are neurodegenerative diseases an...

What are neurodegenerative diseases and how might they be treated? Neurodegenerative diseases that include Alzheimer's, Parkinson's, Huntington's, and amyotrophic lateral scler

Define growth and development of infants and preschoolers, Define Growth an...

Define Growth and Development of Infants and Preschoolers? In this unit, we learnt about the various aspects related to the growth and development of infants and preschoolers.

Define the flavonoids, Define the Flavonoids? Flavonoids constitute the...

Define the Flavonoids? Flavonoids constitute the largest group of plan1 polyphenols, generally arc the compounds of low molecular weight, bound to sugar molecules. You may be f

Determine the function of osseointegration, Determine the function of Osseo...

Determine the function of Osseointegration Osseointegration is also a measure of implant stability, which occurs at two stages- primary and secondary. Primary stability has be

How much minerals should be taken for management of obesity, How much Miner...

How much Minerals should be taken for management of obesity? A diet high in sodium may promote retention of fluid in the body. Moderate restriction in the use of common/table s

What will phenotypical feature actually manifested depend, For an individua...

For an individual having a genotype formed of two different alleles that condition different varieties of the same phenotypical trait, upon what will the phenotypical feature actua

Define proline, Define Proline It is a prominent amino acid found in fi...

Define Proline It is a prominent amino acid found in fish and may contribute to sweetness. The sugars ribose, glucose and glucose-6-phosphate are flavour contributors, as is 5-

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