Peculiarities of mitosis - cleavage, Biology

Peculiarities of Mitosis - Cleavage

From the following you will learn that the mitosis in the phase of cleavage has some striking peculiarities:

a) Synchronization of cell divisions of blastomeres: The early blastomeres divide simultaneously (synchronously) producing two blastomeres from zygote followed by 4,8,16,32 and so on, in most cases. However, such synchronization is lost, during later cleavage divisions.

b) No interphase between two successive divisions, i.e. here is no growth in the amount of cytoplasm in the derived blastomeres with the result that the size of daughter blastomeres continues to decrease during successive cleavages.

c) The size of the nucleus remains practically unchanged. Therefore the nucleus: cytoplasm ratio, which is very small in the fertilized egg cell or zygote, continues to increase in the blastomeres derived from successive cleavage divisions.

d) Rate of cell divisions is very rapid and very large number of cells is produced during cleavage. This is possible due to absence of interphase. The rate slows down later on.

Posted Date: 1/25/2013 12:57:19 AM | Location : United States







Related Discussions:- Peculiarities of mitosis - cleavage, Assignment Help, Ask Question on Peculiarities of mitosis - cleavage, Get Answer, Expert's Help, Peculiarities of mitosis - cleavage Discussions

Write discussion on Peculiarities of mitosis - cleavage
Your posts are moderated
Related Questions
sir i''m not understanding cell division rightly. in case of meiosis both paternal and maternal chromosome goes in two cell separately while in case of mitosis they go alongwit

Explain about the Pulmonary and Respiratory System? With aging the chest wall becomes stiffer and less compliant and the muscular force of the diaphragm is reduced causing less

Write two functions of proteins in biological systems. The important functions of proteins in biological systems are as follows: enzymes membrane carriers anti

what is phylum protozoa

Which type Ribosome occurs exclusivley in Mitocondria?

classification of excretory organs in helminthes, nermatodes, annelids, molluscs, arthropods and echinodems

What are the three main types of RNA? What is meant by heterogeneous RNA? Messenger RNA, or mRNA, transfer RNA, or tRNA, and ribosomal RNA, or rRNA, are the three main kinds of

How Thirst and satiety influence water intake? Thirst and satiety influence water intake, apparently in response to changes sensed by the mouth, hypothalamus and nerves. When t

Fensom and Spanner Electroosmotic Flow Hypothesis In electroosmosis the ions flow across a membrane in response to electrical gradient. Ions pull along water and other content

Hemerythrins - Respiratory Pigments The Hemerythrins are rather rare. They take place in some animals belonging to the minor phyla like the sipunculid worms, some brachiopods,