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

Spermatogonia - spermatozoa, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 Spermatogonia - Spe

Terrestrial biomes of the world, The primary factors that influence the for...

The primary factors that influence the formation of these biomes are climatic, like precipitation, temperature, seasonal extremes and winds. However, topography and light are also

What is the destination of the notochord, Q. What is the destination of the...

Q. What is the destination of the notochord in protochordates and in vertebrates? In vertebrates the notochord disappears and gives birth to the spinal column known as vertebra

Define the recommended dietary allowance for thiamin (rda), Define the Reco...

Define the Recommended Dietary Allowance for Thiamin (RDA)? Thiamin, as it must be clear by now, is needed mainly for the metabolism of carbohydrate, branch-chained amino aci

Explain what an isotonic fluid loss means, Your client has the flu and repo...

Your client has the flu and reports 5-6 loose stools a day. He has experienced an isotonic fluid volume loss. Explain what an isotonic fluid loss means.

Gene targeting in es cells, Gene targeting in ES cells: In some of the li...

Gene targeting in ES cells: In some of the livestock species pro-nuclear injection cannot be used to modify the animals' own genes due to various reasons especially non availabil

What electrocardiogram results show a shortened qt interval, Electrocardiog...

Electrocardiogram results show a shortened QT interval and an increase in the P-R interval (i.e., decreased duration of action potential and decreased conduction velocity). Laborat

Contraindications for beta-blockers, Reversible airways obstructive disease...

Reversible airways obstructive disease, advanced heart block, or episodic decompensation.  Vasodilators Agents that dilate arteriolar smooth muscle and lower peripheral vascu

Cleft grafting, Cleft grafting  The stem of the stock is cut across....

Cleft grafting  The stem of the stock is cut across. A 'V' shaped insertion is made at the end of the stock. The scion is cut in shape. The scion is inserted into the 'V'

Phylum protozoa, what is holozoic, holophytic, saprozoic nutrition

what is holozoic, holophytic, saprozoic nutrition

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