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Topic 2.5 Cell division PowerPoint PPT Presentation

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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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Topic 2.5 Cell division

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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.

When this happen, uncontrolled cell division can occur resulting in the formation of tumours.

2.5.2 Uncontrolled cell division: tumours cells

2.5.3 Interphase




2.5.4 The phases of Mitosis: Prophase

  • Chromosomes supercoil and become visible

  • The spindle of microtubules forms from the MTOC (microtubule organizing centre)

    • In animal cell, the centrioles divide and move to opposite ends (poles) of the nucleus.

    • In plant cells, there are no centrioles and the spindle microtubules forms independently.

  • Each chromosome consists of two chromatids held together by the centromere.

  • Nuclear envelop breaks down.

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.

Chromosomes uncoil

The cytoplasm divide by a process called Cytokinesis.

Cytokinesis: Cytoplasm division

2.5.5 Explain how mitosis produce

two genetically identical nuclei

2.5.6 Why do cells divide?

Asexual Reproduction

Growth & Embryonic Development

Tissue Renewal

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

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