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

Skeletal system - vertebral column, VERTEBRAL COLUMN - It is curved ...

VERTEBRAL COLUMN - It is curved vertical about 70 cms. long. It consists of 33 vertebrae (after fusion 26). It shows 4 curvatures - (i) Cervical curvatures

Gill slits, Gill slits are the opening or the clefts between the gill arch...

Gill slits are the opening or the clefts between the gill arches in the fish. Water taken in by the mouth passes through the gill slits and bathes the gills. It also has rudimenta

Life cycle of sporozoans, Life cycle of sporozoans The complex life cy...

Life cycle of sporozoans The complex life cycle of sporozoans typically involves an asexual and a sexual phase. Sporozoans are haploid except for the zygote. The zygote underg

Discuss various methods of dry heat sterilization, Question 1 List the dif...

Question 1 List the differential staining techniques used in microbiology laboratory. Explain Gram staining technique in detail. Add a note on modifications of Gram staining and a

Define briefly about the copper, Define Briefly about the Copper? As ea...

Define Briefly about the Copper? As early as the times of Hippocrates, copper compounds were used to treat various diseases. However, in the 20" century, it was noticed that an

Define plate counts and colony forming unit, Define Plate Counts and Colony...

Define Plate Counts and Colony Forming Unit? Plate counts is the most frequently used method to measure microbial numbers. The technique, however, can be used only for those mi

Excitation of heart - circulation, Excitation of Heart - Circulation T...

Excitation of Heart - Circulation The heart has an inherent capacity to contract rhythmically without any external stimulus. Proof of this is obtained when we see that the hea

Agro industrial-phenolic compounds, Phenolic compounds Gossypol: Gos...

Phenolic compounds Gossypol: Gossypol is a toxic compound found in the cotton plant. It is concentrated in the cottonseed but can also be found in other parts of the cotton

Dietary management during atherosclerosis, Q. Dietary management during ath...

Q. Dietary management during atherosclerosis? Dietary management and the nutrient requirements during atherosclerosis remain the same as for the management of dyslipidemia. Hen

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