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

Causes of apomixis, Causes of Apomixis Apomictic species are generall...

Causes of Apomixis Apomictic species are generally hybrids or polyploids, as a consequence, there is irregular meiosis. Apomixis appears to be controlled by a set of genes. T

What is cellular regeneration, What is cellular regeneration? How is mitosi...

What is cellular regeneration? How is mitosis related to this process? Some tissues are able to regenerate when injured. The liver, for instance, regenerates when small pieces

Artificial kidney, ARTIFICIA L KIDNEY - Dialysis employs the process o...

ARTIFICIA L KIDNEY - Dialysis employs the process of diffusion across a semipermeable membrane to remove unwanted urea . Dialysis is of 2 types - 1. Haemodialysis -

Diet counseling for a successful weight reduction programme, Explain the Di...

Explain the Diet Counseling for a successful weight reduction programme? As discussed above diet counseling is a very important aspect of a successful weight reduction programm

Fixism what are the main arguments that favor evolutionism, In the scientif...

In the scientific competition against fixism what are the main arguments that favor evolutionism? The major arguments in favor of evolutionism are paleontological, from the stu

What is the functionality of lungs in human biology, What is the functional...

What is the functionality of Lungs in human biology? The right lung consists of three lobes, and the left lung, two lobes. Both lungs hold between 5 to 6 L of gas, called the t

Water absorption and transpiration, Water Absorption and Transpiration ...

Water Absorption and Transpiration The rate of water absorption is controlled by the rate of transpiration. A high water potential in the atmosphere would reduce water loss fr

What is the association between sunrays and vitamin d, Q. What is the assoc...

Q. What is the association between sunrays and vitamin D? Vitamin D or calciferol is synthesized in the skin by the action of the ultraviolet range of sunrays upon precursor mo

Find a chemically gated protein, You have identified a protein in a cell th...

You have identified a protein in a cell that you know that comes from the human body. With respect to that protein you have also determined that it allows sodium ions to go through

Genetics, polymorphism and its causes

polymorphism and its causes

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