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

Induction of hydrolases - responses to infection, Induction of hydrolases -...

Induction of hydrolases - Responses to Infection Plants do respond to attack by pathogens. To restrict their spread the cells synthesise and secrete enzymes to hydrolyse the c

Why body composition assessment is done in sports & exercise, Why Body comp...

Why Body composition assessment is done in sports and exercise? Body composition assessment is generally done in sports and exercise for the following reasons: 1) It can ser

Define systematic botany - taxonomy, Define Systematic Botany - Taxonomy? ...

Define Systematic Botany - Taxonomy? We will now learn something mare about systematic botany. The early recognition of harmful and useful plants was the beginning of systemati

Homeostasis solution, In biology, Homeostasis is the ability of an open pro...

In biology, Homeostasis is the ability of an open program to manage its internal environment to sustain constant circumstances through several energetic stability improvements mana

Explain the relaxing incision - endodontic surgery, Explain the Relaxing In...

Explain the Relaxing Incision - Endodontic Surgery A short vertical incision placed in the marginal and attached gingival, and located at the extent of the Horizontal incision

Dormant vegetative structures, Dormant Vegetative Structures You have ...

Dormant Vegetative Structures You have learnt that light a period of chilling or application of gibberellin often breaks seed dormancy and stimulates seed germination. Vegetat

What is a brain freeze, What is a brain freeze? What is commonly referr...

What is a brain freeze? What is commonly referred to as 'brain freeze' happens when you ingest something that is very cold too rapidly. When the cold touches your soft palate i

Incomplete dominance (1:2:1), INCOMPLETE DOMINANCE (1:2:1) Sometimes tw...

INCOMPLETE DOMINANCE (1:2:1) Sometimes two genes of allelomorphic pair do not show dominant-recessive relationship, but when present simultaneously (or come together), they sho

Shifting attention by dopamine, Q. Shifting attention by Dopamine? Dopa...

Q. Shifting attention by Dopamine? Dopamine: Dopamine plays a pivotal role in aspects of shifting attention. Administration of D1/D2 receptor antagonist haloperidol impairs the

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