Principles governing cleavage, Biology

Assignment Help:

Principles Governing Cleavage

a) The nucleus and mitotic achromatic figure tend to occupy the centre of active cytoplasmic density of the dividing cells, e.g., in isolecithal eggs or microlecithal eggs, the spindle is formed centrally in the cell while in the telolecithal eggs, and it is formed nearer the animal pole.

b) Each new cleavage furrow tends to intersect the plane of the preceding cleavage furrow at right angle.

c) The cells or blastomeres tend to divide into two equal sized daughter cells unless yolk is unevenly distributed.

d) Free sides of the blastomeres tend to become rounded.


Related Discussions:- Principles governing cleavage

Middle lamella, MIDDLE LAMELLA It is thin, amorphous, intercellular ...

MIDDLE LAMELLA It is thin, amorphous, intercellular matrix between 2 adjacent plant cell. The cells of plant tissue generally cemented together by an intercellular matrix

Explain the effect of deficiency of thiamin, Explain the Effect of Deficien...

Explain the Effect of Deficiency of Thiamin? Thiamin deficiency causes the disease beriberi in human beings, which has been classically considered to exist in dry (paralytic) a

Control of pollution, Control of Pollution We have seen that pollution...

Control of Pollution We have seen that pollution affects human health, 'vegetation, crop yield, trees, fisheries, forests, buildings, archaeological monuments, tourism. These

Explain results of abdominal aneurysm surgery, Explain Results of  abdomin...

Explain Results of  abdominal aneurysm surgery? Results:  For ascending aorta replacement, the hospital mortality varies from 0 to 9 per cent. Aortic arch has higher risk of

Are viruses cellular beings, Q Are viruses cellular beings? Viruses are...

Q Are viruses cellular beings? Viruses are considered living beings but they don't have cellular structure. There are few controversies regarding their classification as liv

What is parasitism, What is parasitism? Parasitism is the ecological in...

What is parasitism? Parasitism is the ecological interaction in which a being lives at the expense of another. The parasite often does not cause immediate death of the host sin

Cytochemistry, Cytochemistry It is well known that certain stains and d...

Cytochemistry It is well known that certain stains and dyes specifically combine with certain chemical components of the cell. Cytochemical techniques take advantage of this fa

Reproduction, when pollen tube enters the embryo-sac,it has;

when pollen tube enters the embryo-sac,it has;

How vaginal infections cause, How Vaginal infections cause Sulfonamide ...

How Vaginal infections cause Sulfonamide creams, other ''broad-spectrum'' vaginal preparations, and currently available preparations of Lactobacillus  species or dairy products

Protein folding, Protein Folding With all the known information of prot...

Protein Folding With all the known information of protein structure from X-ray and NMR studies and one might expect in which we would know how proteins fold up within structure

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