Basic planes of cleavage, Biology

Assignment Help:

Basic Planes of Cleavage

The basic planes along which the egg and its daughter blastomeres are divided during early cleavage are:

A. Meridional Plane - the cleavage furrow passes from the animal pole to the vegetal pole through the centre of the spherical egg or the blastomeres so as to divide the egg into two equal halves, e.g., first cleavage furrow in the chick and first as well as second cleavage furrows in the frog's egg.

B. Vertical Plane - the cleavage furrow forms parallel to animal-vegetal axis but a little away from the centre of the blastomeres, e.g., thud cleavage plane of chick blastoderm.

C. Equatorial Plane - the cleavage furrow bisects the egg at right angle to the median axis exactly half way between the animal and vegetal poles the cleavage furrow appears along the equator of the spherical egg, e.g. the third cleavage plane of sea urchin.

D. Latitudinal or transverse or horizontal plane - it is like equatorial but the cleavage furrow passes through the egg cytoplasm on either side of equator along the latitudes of the egg sphere, e.g., third cleavage plane of amphibian eggs.


Related Discussions:- Basic planes of cleavage

Explain the oligosaccharides (dp: 3-9) - carbohydrates, Explain the Oligosa...

Explain the Oligosaccharides (DP: 3-9) - carbohydrates? Oligosaccharides consists of short chains of monosaccharide units joined by covalent bonds. The glycosidic bond may be α

Introduction to biodiversity, Biological diversity is the new buzzword, the...

Biological diversity is the new buzzword, the magic door to international funding and global travelling. We share the earth with million of other living beings. Just as we humans m

Buffalo-pox, Buffalo-pox The disease is caused by an orthopox virus, c...

Buffalo-pox The disease is caused by an orthopox virus, closely related to the vaccinia virus. It is not clear whether it should be considered a separate virus or not. By RE m

Living matter, LIVING MATTER Since at the subatomic level, all matter i...

LIVING MATTER Since at the subatomic level, all matter is basically similar, the fundamental chemical and physical principles are equally applicable to all objects in nature; y

Illustrate the structure of the central nervous system, Q. What is the stru...

Q. What is the structure of the central nervous system that regulates pulmonary respiration? The reaction is catalyzed by the enzyme carbonic anhydrase present in red blood cel

What is dyslipidaemia, What is Dyslipidaemia ? The results of epidemiol...

What is Dyslipidaemia ? The results of epidemiological studies, as well as trials with angiographic or clinical endpoints, confirm the importance of various lipid fractions in

What is the reason of post endodontic disease, What is the reason of post e...

What is the reason of post endodontic disease ? Either there is persistent or reintroduce intracanal microorganisms.. that means if I do improper instrumentation, improper clea

What is technetium 99m sestamibi scan, Q. What is Technetium 99M Sestamibi ...

Q. What is Technetium 99M Sestamibi Scan? This study is another form of studying perfusion of the heart. This radioactive study is similar to that of thallium 201. With a combi

Fallopian tube, Fallopian tube: There are two fallopian tubes connec...

Fallopian tube: There are two fallopian tubes connected to the uterus one on each side of it. The ovum released from the ovarian follicle enters the fallopian tube. Th

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