3 Bologybasics cell divison cycle

 




















CELL DIVISION CYCLE


(a) Cells go through phases of a cell cycle during their life before they divide to from new cells All cells are derives from Preexisting cells, This is called cell division cycle.

The cell cycle includes two main parts 

(i) Cell division and 

(ii) inter phase.

Muscle and nerve cells do not divide


Response for Cell Division

Cell growth repair and replacement or damage cell pars.

Reproduction of the species.


Types of cell visions.

(i) Mitosis : It is a process by which a cell which has previously replicated chromosome in the nucleus of the cell is separated in to two identical sets of chromosome. It is also called equational division.'

(ii) Meiosis : It is one type of reduction division of reproductive cell which takes place mainly during the formation of haploid hamates i.e ova and sperm.

(b) Inter phase

Inter phase is the longest part of cell and is called the resting stage Because the cell is nt dividing in this stage.

Cells grow develop and carry on all heir normal metabolic function during inter phase.

Important terms of Cytology

Genotype : Genetic constitution of organisms. 

Phenotype : the character of organism which can be seen directly.

Haloid : Single set of chromosome in cell which is found in gametes.

Diploid : Two complete set of chrisoms which is found in somatic cell.

Karyokinesis : Division of nucleus during cell division.

Cytokinensis: Division of cytoplasm.













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