Somatic Cell Division

Somatic Cell Division

G1 - Cell highly active -> duplicating organelles and synthesising proteins.

S - replicates DNA.

G2 - Continues increasing in size and making more proteins.

MITOSIS AND CYTOKINESIS

Early prophase - chromatin fibres fold into chromosomes.

Late prophase - mitotic spindle forms made of microtubules, they connect to kinetochore at centre of each chromosome. Nucleolus diminishes.

Metaphase - mitotic spindle lines chromosomes in centre of cell along the metaphase plate.

Early anaphase - centromere + kinetochore of each chromosome split, forming sister chromatids. They are pulled to opposite poles of the cell.

Late anaphase - sister chromosomes pulled further apart as microtubules shorten. Microtubules not attached to kinetochore lengthen.

CYTOKINESIS - cytoplasm of cell begins to divide. Contractile ring develops +

Telophase - nucleolus reappears; chromosomes uncoil back into chromatin; microtubules of mitotic spindle break up.

G0 - Quiescent phase (pause)

OR BACK TO G1

INTERPHASE

MITOTIC PHASE