Home | | Botany 11th std | Mitogens

Cell Cycle | Botany - Mitogens | 11th Botany : Chapter 7 : Cell Cycle

Chapter: 11th Botany : Chapter 7 : Cell Cycle

Mitogens

The factors which promote cell cycle proliferation is called mitogens.

Mitogens

 

The factors which promote cell cycle proliferation is called mitogens. Plant mitogens include gibberellin, ethylene, Indole acetic acid, kinetin. These increase mitotic rate.

 

Mitotic Poisons (Mitotic Inhibitors)

 

Certain chemical components act as inhibitors of the mitotic cell division and they are called mitotic poisons.

 

Endomitosis

 

The replication of chromosomes in the absence of nuclear division and cytoplasmic division resulting in numerous copies within each cell is called endomitosis. Chromonema do not separate to form chromosomes, but remain closely associated with each other. Nuclear membrane does not rupture. So no spindle formation. It occurs notably in the salivary glands of Drosophila and other flies. Cells in these tissues contain giant chromosomes (polyteny), each consisting of over thousands of intimately associated, or synapsed, chromatids. Example: Polytene chromosome.

 

Anastral

 

This is present only in plant cells. No asters or centrioles are formed only spindle fibres are formed during cell division.

 

Amphiastral

 

Aster and centrioles are formed at each pole of the spindle during cell division. This is found in animal cells.


Tags : Cell Cycle | Botany , 11th Botany : Chapter 7 : Cell Cycle
Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
11th Botany : Chapter 7 : Cell Cycle : Mitogens | Cell Cycle | Botany


Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.