Give 3 reasons why multicellular organisms require a continuous supply of new cells. 

  1. Growth (we need more cells as we grow).


  1. Development (we need new cell types as we develop new tissues).


  1. Repair (we need to replace the cells we lose each day).

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What is the cell cycle?

The cell cycle is the series of steps that take place as a cell grows and then divides.

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Where in the body does mitosis take place?

Everywhere.

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How many cells does mitosis produce? 

Mitosis produces 2 cells.


1 cell divides into 2 cells.

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What do we call the cells produced by mitosis?

Daughter cells. 

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Are the cells produced by mitosis genetically identical or unique?

The cells are genetically identical.

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How many divisions are there when a cell divides by mitosis?

1 division.

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How many pairs of chromosomes do most human cells have?

23 pairs of chromosomes.

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What are the steps of mitosis and cytokinesis?

  1. DNA condenses to form chromosomes.
  2. Chromosomes line up along the centre (equator) of the cell.
  3. Cell fibres pull the two arms of each chromosome to opposite sides (poles) of the cell.
  4. Cytokinesis - the entire cell divides to form two identical daughter cells.

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