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

Head - structure of the sperm, Head - Structure of the Sperm It exhib...

Head - Structure of the Sperm It exhibits a diversity of shapes in different animal groups, e.g., spherical (teleost fishes), rod or lance shaped (amphibians), spirally twist

Sea Lampreys, #questiHow do the non parasitic lampreys interact with other ...

#questiHow do the non parasitic lampreys interact with other members of their ecosystem in comparison to their parasitic cousinson..

Explain foscarnet, Foscarnet  (Foscavir)  Foscarnet is an alternative t...

Foscarnet  (Foscavir)  Foscarnet is an alternative to ganciclovir and valganciclovir for treatment of CMV infection. It is approved for use in CMV retinitis, including progress

Define about the photometry - colorimetry, Define about the Photometry - co...

Define about the Photometry - colorimetry? Photometry is the measurement of the luminous intensity light or the amount of luminous light falling on a surface from such a source

Define alanine cycle, Alanine cycle Alanine Cycle  :  In the alanine ...

Alanine cycle Alanine Cycle  :  In the alanine cycle the pyruvate formed from glycolysis  in  the muscle is converted  to alanine by transamination  reaction. Alanine is rele

Types of lysosomes, TYPE S OF LYSOSOMES (1 )      Primary Lysosomes ...

TYPE S OF LYSOSOMES (1 )      Primary Lysosomes or storage granules or protolysosome - The primary lysosomes are smaller in size, they contain hydrolytic enzyme in the form

What is the action mechanism of the antibiotic penicillin, Penicillin, disc...

Penicillin, discovered by the Scottish doctor Alexander Fleming, in 1928, is a drug that inhibits enzymes essential for the synthesis of peptidoglycans, a constituent of the bacter

How is a disease-resistant plant selected for breeding, How is a disease-re...

How is a disease-resistant plant selected for successful breeding? Why is the process of fertilisation in a flowering plant referred to as double fertilisation? Explain. Nam

Respiratory system of the phylum annelida characterized, Q. How is the resp...

Q. How is the respiratory system of beings of the phylum Annelida characterized? Respiration in annelids can be branchial or cutaneous. Cutaneous respiration takes place due to

Particulate theory - pre-mendelian theory, Particulate Theory (i)      ...

Particulate Theory (i)         Maupertuis (1689-1759) proposed that the body of each parent give rise to minute particles. (ii)         In sexual reproduction, these particl

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