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

Differance among subphylum chaetognatha and urochordata, Explain differance...

Explain differance between Subphylum Chaetognatha and Subphylum Urochordata? Subphylum Chaetognatha: Larval stages of this small group share some of the characteristics with

Define absorption, Define Absorption, Storage and Elimination of vitamins? ...

Define Absorption, Storage and Elimination of vitamins? Reading through this section you would realize that all fat-soluble vitamins undergo similar metabolic fate. They are a

Coronal disassembly, Coronal disassembly - Coronal restoration in the ...

Coronal disassembly - Coronal restoration in the retreatment phase called coronal deassembling or disassemblying. - Coronal deassembling means removal of coronal and radi

Carbohydrate case study, CT is a 3 year old female who develops signs of hy...

CT is a 3 year old female who develops signs of hypoglycemia in the early morning unless she is fed during the night.  CT eats balanced meals for her age group during the day, with

Contamination of the implant body before insertion, Contamination of the Im...

Contamination of the Implant Body before Insertion The implant may be contaminated by manufacturing error, by the operator, from non titanium instrumentation and by the bacteri

Define altered glucose metabolism - nutrition during stress, Define Altered...

Define Altered Glucose Metabolism - Nutrition during Stress? Blood glucose levels are generally elevated in the infected patient but plasma insulin levels are normal or even hi

What is cold-shortening, What is cold-shortening It is important to poi...

What is cold-shortening It is important to point out that over-effective chilling of hot carcasses can lead to toughness. If the temperature of the meat (muscles) can be reduce

Agro industrial-copper, Copper Copper is an essential trace element re...

Copper Copper is an essential trace element required for enzyme systems, iron metabolism, connective tissue metabolism, integrity of the central nervous and immune systems. Co

Types of retaining structure, What are the types of evaluation of lateral e...

What are the types of evaluation of lateral earth forces acting on retaining structures? This section seeks to introduce you to the evaluation of lateral earth forces acting on

Which are the living beings that carry out photosynthesis, Which are the li...

Which are the living beings that carry out photosynthesis? Which is the cell organelle responsible for the absorption of light for the photosynthesis process in plants and algae?

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