Nuclear Division

Nuclear Division can happen through

1. M phase of the cell cycle (Mitosis)

2. Meiosis NOT PART OF THE CELL CYCLE 

What is mitosis and what does it produce

Mitosis is the mechanism used to divide a parent cell into two identical daughter cells

daughter cells are genetically identical to parent cell 

Where does mitosis occur

occurs in the m-phase of the cell cycle (takes up only 10% of cell cycle and occurs in all somatic cells 

Why does mitosis occur

• growth of an organism

• asexual reproduction

• regeneration of body parts 

• replacement/repair of damaged somatic cells 

Stages of Mitosis

• prophase

• metaphase

• anaphase

• telophase

Prophase

• DNA is condensed from chromatin into chromosomes

• nuclear membrane disintegrates

• nucleolus shrinks and disappears

• centrioles move to opposite poles of cell

Metaphase

• spindle fibres from each centriole attach to each sister chromatid at the kinetochore

• drag and line up the chromosomes to the middle/equator of cell

Anaphase 

• pull chromatids apart by shortening of spindle fibres 

• sister chromatids migrate to the opposite ends of the cell

• mitochondria supply energy needed for this phase

Telophase

• sister chromatids reach opposite poles

• uncoil and form chromatin

• spindle fibres disintegrate

• nuclear membranes form + nucleoli reappear