Modification of mitosis, Biology

Assignment Help:

MODIFICATION OF MITOSIS

1.      CRYPTOMITOSIS OR PROMITOSIS :

Primitive type of mitosis. In this mitosis nuclear membrane not disappear (remain intact throughout the division). All the change of karyo kinesis occur inside nucleus even the formation of spindle (intranuclear spindle) centriole is absent. Occur in some protozoa animal during binary fission eg. amoeba.

2.      DINOMITOSIS :

Cell division of dinoflagellate. Dinoflagellate are mesokaryotyes Eukaroytes in which chromatid threads without histone due to absence of histone, chromosome fail to condense properly so chromosome are not distinclly visible during division.

3.      FREE MUDELUR DIVISION :

Karyo kinesis is not followed by cytokinesis. These lead to coenocytic condition. eg. acellular slime mouldes, endosperm.

4.      ENDOMITOSIS :

Division or duplication of chromosome without division of nucleus. Endomitosis lead to polyploidy. Increase no of set chromosome. Colchicine induce polyploidy in plants. It is a mitotic poison. Interferes in normal mitosis retards the arrangement of spindle fibre. Arrest the cell cycle at metaphase.

Besides colchicine Mustard gas and Ribonucleases are also mitotic poison. They inhibit protein synthesis. Stop cell cycle in G phase. Total blockage of mitosis occur.


Related Discussions:- Modification of mitosis

Spoilage of soft drinks, Q. Explain Spoilage of Soft Drinks? We all co...

Q. Explain Spoilage of Soft Drinks? We all consume soft drinks, fruit juices, as well as, preserves, which normally are available in the market as tetrapacks, cans, bottles

Examine the differences between dna and rna, Examine the differences betwee...

Examine the differences between DNA and RNA. Explain why DNA is the most favorable molecule for genetic material and how RNA compares to it in this respect.

What is meant by the arch reflex, Q. What is meant by the arch reflex? ...

Q. What is meant by the arch reflex? In some situations the movement of the skeletal striated muscles does not depend upon commands of the superior motor neurons that it is not

Respiration - metabolism of pollen tubes, Respiration - Metabolism of Polle...

Respiration - Metabolism of Pollen Tubes In the unpollinated pistils of Hippeastrum hybridum very high O 2 , tension exists from stigma down through most of the style. During

Gene expression is controlled by chromatin state, Gene expression is contro...

Gene expression is controlled by chromatin state, _______ and _________. a. transcription factors and epigenetic regulators b. polymerases and control proteins c. delta and tau pro

Scientific method, SCIENTIFI C METHOD - The scientific approach to exp...

SCIENTIFI C METHOD - The scientific approach to explain a particular phenomenon require a series of organized steps based on common sense. It is called scientific method. A

What is enzyme assay, What is Enzyme assay Enzyme assay may also be use...

What is Enzyme assay Enzyme assay may also be used to determine whether stored plant products are suitable for use as food commodities, for e.g.  α-amylase should be present

Genomic clone, Genomic clone is the piece of a DNA taken from genome of a ...

Genomic clone is the piece of a DNA taken from genome of a cell or an animal, and spliced into the bacteriophage or other kind of cloning vector. A genomic clone might contain cod

Newcastle disease / ranikhet disease (nd/rd), N e wcastle disease / Ranik...

N e wcastle disease / Ranikhet disease (ND/RD) This disease is caused by Newcastle disease virus (NDV) belonging to the genus Paramyxovirus of the family Paramyxoviridae. Alo

How is the structure of a mitochondrion well adapted, How is the structure ...

How is the structure of a mitochondrion well adapted for the activities it carries out? The mitochondrial membranes segregate the enzymes and reactants of the Krebs cycle, faci

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