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

Explain about ecological species concept, Q. Explain about Ecological speci...

Q. Explain about Ecological species concept? The ecological species concept: This identifies a species as a population that occupies a distinct ecological niche, whence its rep

Describe class diplopoda and chilopoda in detail, Describe Class Diplopoda ...

Describe Class Diplopoda and Chilopoda in detail? Members of the Subphylum Crustacea and the Subphylum Uniramia have one major characteristic in common. Both groups have biting

Explain how blue white selection works, The plasmids below show the inserti...

The plasmids below show the insertion of the EZH2 gene into the pBluescript plasmid in either sense (forward) or antisense (reverse) orientation. These are the plasmids you will ho

How is the cooling of tissues and organs, Q. How is the cooling of tissues ...

Q. How is the cooling of tissues and organs for medical transplants associated with the effect of temperature upon enzymatic reactions? The molecular degradation during the dec

What are the three parts of a dna nucleotide, What are the three parts of a...

What are the three parts of a DNA nucleotide, and how are they connected to each other? The three types are a deoxyribose sugar, a phosphate group, and a nitrogenous base. The

What are the positions of myosin and actin molecules, Q. What are the posit...

Q. What are the positions of myosin and actin molecules in the sarcomere before and during the muscle contraction? Schematically actin filaments attached perpendicularly to bot

How does the study of fossils strengthen theory of evolution, How does the ...

How does the study of fossils strengthen the theory of evolution? The study of fossils reveals extinct and ancient species having many similar structures to others of the prese

Give the genotypes, Achondroplasia is an autosomal dominant disorder associ...

Achondroplasia is an autosomal dominant disorder associated with a gene on chromosome 4. Sickle cell anemia is due to a gene on chromosome 11. A man and a woman with achondroplasia

Is it possible to perform investigation of natural paternity, Is it possibl...

Is it possible to perform investigation of natural paternity, maternity or brotherhood and sisterhood using the ABO blood typing? By using the ABO blood typing it is possible o

Invertebrete zoology, give an example invertebrate phylum/phyla for protopl...

give an example invertebrate phylum/phyla for protoplasmic grade organization

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