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

Define etiology and clinical features of epilepsy, Define Etiology and Clin...

Define Etiology and Clinical Features of Epilepsy? This disorder usually starts in childhood, with the peak incidence between birth and two years. Etiological factors include

Stage of total biological inactivity, Q. Is the stage when an insect larva ...

Q. Is the stage when an insect larva is within a cocoon a stage of total biological inactivity? The period when the larva is inside its cocoon is a time of intense biological a

Which foods are used by microorganisms for energy, Q. Which Foods are used ...

Q. Which Foods are used by Microorganisms for Energy? The carbohydrates, especially the sugars, are most commonly used as an energy source, but other carbon compounds can also

What is criminal law, What is criminal law? Criminal law: A crime ...

What is criminal law? Criminal law: A crime is an offence against society that accepted behaviours and is illegal by law. These all persons accused are prosecuted through

What is the essential concepts of endosseous healing, Essential Concepts of...

Essential Concepts of Endosseous healing 1) Osteoblast is the prime bone matrix synthesizing cell. Like most secretory cells, osteoblasts are polarized cells, and the direction

Define maternal nutrition and foetal outcome, Define Maternal Nutrition and...

Define Maternal Nutrition and Foetal Outcome? Maternal malnutrition has deleterious effects on both the mother and the offspring.  Inadequate energy intakes, iron deficiency an

Fossilisation, FOSSILIS A TIO N - The organisms are preserved and...

FOSSILIS A TIO N - The organisms are preserved and fossilized when they are buried in the ice, in an oil rich soil, in the lava of volcano, in swamps, in desiccated deser

Traditionally value biological resources, However, according to conventiona...

However, according to conventional principles of economic analysis it is necessary that a resource is used for it to acquire a value. Consequently economists traditionally value bi

What is hdls, HDLs have the opposite function to that of LDLs in which they...

HDLs have the opposite function to that of LDLs in which they deleted cholesterol from the tissues.  The HDLs are synthesized in the blood mainly from components derived from the d

Explain non-surgical endodontic retreatment - missed canal, Explain Non-sur...

Explain Non-surgical Endodontic Retreatment - Missed Canal Missed root canal as it hold pulp tissues and bacteria is major cause of endodontic failure. Mandibular molar

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