B1.2 cell division

• The nucleus of a cell contains chromosomes made of DNA molecules
• Each chromosome carries a large number of genes and chromosomes are often found in pairs
• Cell growth - mitosis

  Mitosis= 1.) copy the DNA

  2.) divide it into two
• Stem cell-

  A cell that hasn’t yet become specialise
• Where can a stem cell be found?

  -embryos or bone marrow
• Stem cells in plants- meristems 


  Plant growth occurs in areas called meristems
• Stem cells can come from meristems
• Steps of the cell cycle?

  1> Growth

  2> DNA replication + mitosis

  3>division
• What happens In the 1st stage of the ‘cell cycle’?

  Growth, increase the number of sub-cellular structures like mitochondria and ribosomes
• What happens in the 2nd stage of the ‘cell cycle‘ ?


  The DNA is duplicated, so the 2 new cells will both have a full set of DNA