Topic 2.5 Cell division. 2.5.1 Cell Cycle. 2.5.2 Uncontrolled cell division: tumour cells. The cell division cycle is regulated in a number of ways. Certain agents can damage these regulatory elements.
The cell division cycle is regulated in a number of ways.
Certain agents can damage these regulatory elements.
When this happen, uncontrolled cell division can occur resulting in the formation of tumours.
S OF INTERPHASE
G2 OF INTERPHASE
MTOC (pair centrioles)
Spindlemicrotubules attaches to the chromosomes by means of the centromere.
Chromosomes are moved to the equator of the cell,
The pair of sister chromatids separate and the spindle microtubules pull them towards opposite poles of the cell.
The chromatids have now reached the poles and can be regarded as distinct chromosomes.
The nuclear envelop forms around each group of chromosomes.
The cytoplasm divide by a process called Cytokinesis.
two genetically identical nuclei
Growth & Embryonic Development
Tissue renewal. This dividing bone marrow cells (arrow) will give rise to new blood cells.
Growth & Development. A sand dollar embryo shortly after the fertilized egg divided forming two cells.
Reproduction. An ameba, a single-celled eukaryote, is dividing into two cells. Each new cell will be an individual organism