mitosis

• what is mitosis for?

  growth, repair and development
• what is mitosis?

  when cells divide to produce 2 daughter cells
• name the 4 stages of the cell cycle

  dna replication, movement of chromosomes, cytokinesis, and the growth of the daughter cell
• first step of DNA replication

  the DNA molecule unzips to form two separate strands, the base pairs are exposed
• second step of dna replication

  the bases on free floating nucleotides pair up with matching bases on the unzipped dna
• third step of dna replication

  the nucleotide and unzipped dna bases form complementary base pairs so two new dna molecules are identical to the original one
• what is the end result of dna replication?

  there are 2 new dna molecules which are identical to the original
• chromosomes

  a long coiled up molecule of dna
• gene

  a short section of dna inside of a chromosome which codes for a specific characteristic
• what is the first step of cell movement?

  the dna forms x shaped chromosomes, each "arm" is a copy of the other
• what is the second step of cell movement?

  the chromosomes line up at the centre of the cell then cell fibres pull them apart
• what is the role of cell fibres ?

  it pulls chromosomes apart to the opposite end of the cell
• what is the third step of cell movement?

  membranes form around each of the chromosome sets to create the nuclei of the two new cells
• what is the last step of cell movement?

  the cytoplasm divides the parent cell into two genetically identical daughter cells , also known as :cytokinesis
• cytokinesis means ...

  the division of the cytoplasm