Mitosis

Interphase: Before and after mitosis it inculdes
G1: normal cell function ~90% of a cells life
S: DNA and centrosome replicated
G2: Cell prepares to divide but the chromosomes aren't visable
Prophase:
Chromatin condenses and chromosomes become visable.
The nucleus disappears and he nuclear envelope breaks down.
Centrosomes migrate to opposite poles.
Spindle fibres form from microtubules to organise chromosomes.
Prometaphase:
Kinetochores assemble at centrosome and microtubules attach at kinetochores connecting the centromeres to the centrioles, Chromosomes begin moving.
Metaphase:
Chromosomes align along the middle of the cell
Spindle fibres co-ordinate movement this helps to ensure chromosomes separate properly so each nucleus has only one copy of each chromosome.
Anaphase
Sister chromatids separate at kinetochores and move to opposite poles they are pulled at the centrosome by motor proteins along microtubules
Telophase
Chromosomes arrive at opposite poles: daughter nuclei form and nucleoli from. Chromosomes are no longer visible.
Cytokinesis: DNA goes back to chromatin
Animal Cell: Belt of actin microfilaments form around equator of cell splitting the cell in two
Plant Cell: formation of new cell wall.

	Created by Beckie Thorne over 11 years ago

University Genetics Note on Mitosis and Meiosis, created by Beckie Thorne on 08/05/2015.