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

Explain the occurrence of vitamin C, Explain the Occurrence of Vitamin C ...

Explain the Occurrence of Vitamin C Vitamin C (ascorbic acid) is an active ingredient present in any animal or vegetable cell which occurs in the plant in free form and also bo

Discuss various methods of dry heat sterilization, Question 1 List the dif...

Question 1 List the differential staining techniques used in microbiology laboratory. Explain Gram staining technique in detail. Add a note on modifications of Gram staining and a

Production of substances - responses to infection, Production of substances...

Production of substances interfering with virus proliferation In some cases plants are known to synthesise chemicals that inhibit crucial functions of pathogens. This makes pl

Explain the neurological and sensory system, Neurological and Sensory Syste...

Neurological and Sensory System There are three neurological systems: sensory, motor and autonomic. Sensory system consists of sensory receptors, sensory nerve fibres. Differen

What is the auditory tube and its function, Q. What is the auditory tube an...

Q. What is the auditory tube and its function? Auditory tube (Eustachian tube) connects each middle ear to the throat. This tube conducts air between tympanic cavity and outsid

How to lower the risk of drug-nutrient interactions, How to Lower the Risk ...

How to Lower the Risk of Drug-Nutrient Interactions? Eat a healthy diet using the food guide pyramid. Follow directions on how to take medication (prescription and ove

Chemicals responsible for imparting the sweetness, The chemicals responsibl...

The chemicals responsible for imparting the sweetness, classic salt taste and bitter and sour taste are summarized herewith.  A. Sweet Taste Sweetness is one of the most importa

Can you explain puffeelfish poisoning, Q. Can you explain Puffeelfish poiso...

Q. Can you explain Puffeelfish poisoning? Tetrodotoxin (TTX) causes pufferfish (tetrodon) poisoning, also known as blowfish poisoning or fugu. How does a pufferfish look l

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