mitotic cycle

Cell cycle  

  1. Interphase - the phase of the cell cycle in which the cell is preparing for division  

  1. Mitosis - division of a nucleus into 2 genetically identical nuclei  

  1. Cytokinesis - division of the cytoplasm and organelles to produce 2 genetically identical daughter cells   

Cells reproduce by splitting into 2 cells. The new cells are genetically identical to the parent cells.  

To prepare for division, the cell must duplicate all its contents. This includes the DNA in the nucleus and all the cellular organelles.  

During interphase: -  

  • DNA is replicated  

  • Proteins are synthesized  

  • Organelles are replicated  

  • The cells grow  

  • It is the growth and development phase, and it has 3 steps 

  • G1 phase: (G - growth) 

  • • Here formation of mRNA takes place. 

  • • mRNA is then used for making protein and enzymes. 

  • S phase: (S - synthesis) 

  • • Here, replication of DNA takes place, where unwinding of DNA strands takes place, then each template makes its own complimentary strand 

  • G2 phase: 

  • • Here errors in the DNA are checked and then corrected 

  • • Here formation of spindle fibers and microtubes alse start, to make end of G2 phase. 

 Karyokinesis: - (mitosis) 

 

• It is the nucleus division 

• Here as result of nuclear division, 2 daughter nuclei are formed in one cell 

• Walter Flemming described karyokinesis in animal cells and Strass burger in plant cells 

1. Prophase 

2. Metaphase 

3. Anaphase 

4. Telophase