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.
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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.
When this happen, uncontrolled cell division can occur resulting in the formation of tumours.
2.5.2 Uncontrolled cell division: tumours cells
S OF INTERPHASE
G2 OF INTERPHASE
2.5.4 The phases of Mitosis: Prophase
MTOC (pair centrioles)
2.5.4 The phases of Mitosis: Metaphase
Spindlemicrotubules attaches to the chromosomes by means of the centromere.
Chromosomes are moved to the equator of the cell,
2.5.4 The phases of Mitosis: Anaphase
The pair of sister chromatids separate and the spindle microtubules pull them towards opposite poles of the cell.
2.5.4 The phases of Mitosis: Telophase
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.
Cytokinesis: Cytoplasm division
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